Manganese deposits of the Department of Ranama, Republic of Colombia.
Hand auger and hand drill in prospecting work.
Geology of the Magnetites near Port Henry, New York, and especially those of Mineville.
Sulphur in Embreville pig iron.
Spitzkasten and settling tank.
Chromite deposits on Port au Port Bay, Newfoundland.
Chicago main dranage channel.
Clays and clay working industry of Colorado.
Development of Lake Superior Iron ores.
Methods of iron mining in Northern Minnesota.
Notes on six months’ working of Dover furnace, Canal Dover, Ohio.
Mining methods on the Mesabi range.
Explorations on the Mesabi range.
The Marquette range – its discovery, development and resources.
Some Dike features of the Gogebic Iron range.
Origin and mode of occurrence of the Lake Superior Copper Deposits.
Michigan College of Mines by Dr. M.E. Wadsworth.

Geological Excursion through southern Russia.
Kotchkar gold mines, Ural mountains, Russia.
Mining districts of Colombia.
Notes on the Vein formation and mining of Gilpin county, Colorado.
Manganese ore industry of the Caucasus.
Emery, Chrome ore and other minerals in the Villayet of Aidin, Asia Minor.
Note on Limonite pseudomorphs from Dutch Guiana.
Notes on the Bertrand-Thiel process.
Notes on the geological structure of the Caucasus range along the Georgia military road.
New Breaker at Cranberry coal mine.
Stamp mill indicator diagrams.
Auriferous deposits of Siberia.
Hubnerite in Arizona.
Note on the cost of tunneling at the Melones Mine, Calaveras county, California.
Mill practice of the Utica mills, Calaveras county, California.
Corundum in Ontario.
Description of the Semet-Solvay by-product coke oven plant at Ensley, Alabama.
Notes on the Mines of the Frontino and Bolivia company, Colombia.
Notes on the Operation of a light mineral railroad.
The Kytchtym medal.
Tuyeres in the Iron Blast furnace.

Platinum deposits of the Tura river system, Ural mountains, Russia.
Geologic and economic survey of the clay deposits of the lower Hudson River Valley.
Coking, in Beehive ovens, of the coals of the New River District, West Virginia.
The longest mine haulage by F.Z. Schellenberg.
Gold bearing veins of Bag Bay, near Lake of the Woods.
Patio process in Guanajuato, Mexico.
Notes on the Geology of Sonora, Mexico.
Notes on the Structure of the Rocky Mountains in the Lewis and Clarke Timber Reserve, Montana.
The equipment of camps and expeditions.
Improvements of the Spring Valley coal mines.
Rich patch iron tract, Virginia.
Liberty Bell Gold Mine, Telluride, Colorado.
Investigation of Magnetic iron ores from eastern Ontario.
Lee Long-wall mining machine.
Copper-deposits of Vancouver island.
Mines and mill of the Atacama mineral company, Taltal, Chile.
Occurrence of Tin-ore at Sain Alto, Zacatecas, with reference to similar deposits in San Luis Potosi and Durango, Mexico.
Copper Queen Mine, Arizona.
Manganese deposits of Bahia and Minas, Brazil.
Stoping with machine drills.
Bryan mill as a crusher and amalgamator compared with the stamp battery.
American Transcontinental Lines.
Glacial Erosion and the origin of the Yosemite Valley.
Deep mining at the Utica mine, Angels, California.
Tangenital water wheel
Lagrange dam, California.

Notes on mine surveying instruments, with special reference to Mr. Dunbar D. Scott’s paper on their evolution.
D’Auria air compressor.
Formation of Bonanzas in the upper portions of gold veins.
Caliche of southern Arizona.
Deposits of copper ores at Ducktown, Tennessee.
Problems in hauling and hoisting.
Great oil well near Beaumont, Texas.
Missouri and Arkansas Zinc mines at the close of 1900.
History and conditions of mining in the Richmond coal basin, Virginia.
Recent geological phenomena in the Telluride Quadrangle of the USGS in Colorado.
Zinc and lead deposits of North Arkansas.
Notes on the Pigholugan and Pagtao gold regions, Island of Mindanao, Phillipine islands.
Klein jig and Klein classifer.
Operation of the Hole-contract system in the Center Star and War Eagle mines, Rossland, British Columbia.
Delamar and Horn Silver mines : two types of ore deposits in the deserts of Nevada and Utah.
Notes on the Geology of Southeastern Arizona.
Treatment of tailings by the cyanide process at the Athabasca mine, near Nelson, British Columbia.

 

Ore deposits of Sudbury, Ontario.
Operations of the Hudson River water power company.
Water hoisting in the Pennsylvania anthracite region.
Cost of pumping at the Short Mountain colliery of the Lykens Valley coal company.
Electrical apparatus for coal mining.
Compressed air motors for gathering cars in coal mines.
Notes on accidents due to combustion within air compressors.
Origin of pebble covered plains in desert regions.
Zinc and lead deposits of Northern Arkansas.
Geological relations of the Manganese ore deposits of Georgia.
Notes on the Metallurgy of copper of Montana.
Treadwell group of mines, Douglas Island, Alaska.
Observations on Mother Lode gold deposits, California.
Sperry Vanning Buddle.
Metallurgy of the Homestake ore.
Cyanide plant and practice at the Ymir mine, West Kootenay, British Columbia.
Geology and the copper deposits of Bisbee, Arizona.
Tomstone and its mines.
Gold mining districts of central Siberia.
Copper deposits of the Kaibab plateau, Arizona.
Box electric rock drill.

Wet methods of extracting copper at Rio Tinto, Spain.
Bituminous coal breaker by Lewis Stockett.
A decade in American blast furnace practice.
Use of high percentages of Mesabi iron ores in Coke blast furnace practice.
The volcanic origin of oil by Eugene Coste.
Mineral deposits of Santiago, Cuba.
Sulphide smelting at the National smelter of the Horseshoe Mining Company, Rapid city, South Dakota.
Origin of the magnetic iron ores of Iron county, Utah.
Superficial blackening and discoloration of rocks, especially in desert regions.
Investigation of Alaska’s mineral wealth.
Manufacture of Coke in Peru.
Geology of the Treadwell ore deposits, Douglas Island, Alaska.
Genesis of the copper deposits of Clifton – Morenci, Arizona.
Notes on the gold district of Canutillo, Chile.
Gold mines of the San Pedro district, Cerro de San Pedro, State of San Luis Potosi, Mexico.
Taviche mining district near Ocotlan, State of Oaxaca, Mexico.
Case of Henry Cort. (Inventor : puddling of iron, rolling of puddle iron)
Blast furnace plant at Portoferraio, Elba.

Iron ore deposits of the Moa district, Oriente Province, Cuba.
Origin of the iron ores of Central and Northeastern Cuba.
Occurrence, Origin, and character of the surficial iron ores of Camaguey and Oriente provinces, Cuba.
Mayari and Moa iron-ore deposits in Cuba.
Characteristics and origin of the brown iron ores of Camaguey and Moa, Cuba.
Exploration of Cuban iron ore deposits.
Mayari iron mines, Oriente Province, Cuba, as developed by the Spanish – American Iron company.
Mine caves under the City of Scranton, Pennsylvania. (maps and photos).
Caddo oil and gas field, Louisiana.
Tunnel driving in the Alps. (Mont Cenis, Saint Gothard, Arlberg, Simplon, Loetschberg. Photos)
Mining costs at Park City, Utah.
Geology of the Cobalt district, Ontario, Canada.
Mine rescue service of the State of Illinois.
History and geology of ancient fold fields in Turkey.
Notes on Huntington Mills in Nicaragua.
Newport Iron Mine.
Notes on the Liberty Bell Mine, Colorado.
Cyanide plant at the Treadwell Mines, Alaska.
Gold production in California.
Present day problems in California gold dredging.

Iron ores of the South range of the Cuyuna district, Minnesota.
Titaniferous iron ore deposit in Boulder county, Colorado.
Clinton iron ore deposits in Kentucky and Tennessee.
Manufacture of Coke.
St. Helen’s mining district, Skamania county, Washington.
Occurrence of gold in the Eocene deposits of Texas.
Present conditions of mining in the district of Vladivostok, Siberia.
A trip through northern Korea.
Fires in Metalliferous mines.
Notes on Bag-Filtration plants.
Development of the Parkes process in the United States.
Chemistry of the reduction processes in use at Anaconda, Montana.

India mica industry.
Elk City mining district, Idaho County, Idaho.
Fire clay deposits of Canada.
Electric power installation at El Tigre, Sonora, Mexico.
Hardinge Conical Mill.
London Mine, Mosquito mining district, Park county, Colorado.
Plant for Hadfield Method of producing sound steel ingots.

Assay of gold and silver by the iron nail method.
Hardinge Mills vs. Chilean Mills.
Tin situation in Bolivia.
Discovery and opening of a new Phosphate field in the United States (Rich county, Utah)
Discussion of Ae3 in Carbon-Iron alloys.
New International diamond carat of 200 milligrams.

Mill and metallurgical practice of the Nipissing mining company, Cobalt, Ontario, Canada.
Mining and mining methods in the southeast Missouri disseminated lead district.
Drilling performances at the Kensico Dam, Catskill aqueduct system, New York.
Geology and ore deposits of the Bully Hill mining district, California.
Nickel deposits in the Urals.
Injection of Cement grout into water bearing fissures.
Burning of coal beds in place.
Origin of the “garnet Zones” and associated ore deposits by Waldemar Lindgren.
Application of electric motors to shovels.
Safety of underground electrical installations.
Application of electricity to mines and mills of Witherbee, Sherman and Co., Mineville, New York.
Use of electricity at the Penn and Republic iron mines, Michigan.
Apex law in the Drumlummon controversy.
Location of mining claims upon Indian reservations.
Russian oil fields.
Killing of the burning gas well in the Caddo oil field, Louisiana.

Unit construction costs from the new smelter of the Arizona copper Company.
Mill and metallurgical practice of the Nipissing mining Company, Cobalt, Ontario, Canada.
Chloridizing leaching at Park city.
Playa panning on the Cauca river.
Dorr hydrometallurgical apparatus.
Ancient auriferous gravel channels of Sierra county, California.
Drumlummon mine, Marysville, Montana.
Copper ores of the New London Mine, Maryland.
Occurrence of Bournonite, Jamesonite, and Calamine at Park City, Utah.
Mining methods at the Copper Queen mines, Arizona.
Draining Lake Kerr.
Rope idlers in the Raven shaft.
Mining claims within the National Forests.
Development of the Round table at Great Falls, Montana.
Lead Smelting at East Helena.
The International Lead Refining Plant.
Electrical fume precipitation at Garfield, Utah.
Bag House in lead smelting.
Basic-lined converter practice at the Old Dominion Plant.
Ajo copper mining district, Arizona.
Experimental leaching at Anaconda.

Mayari iron ore deposits, Cuba.
Boulder batholith of Montana.
Main mineral zone of the Santa Eulalia district, Chihuahua.
Cloncurry copper district, Queensland.
Mining and reduction of quicksilver ore at the Oceanic mine, Cambria, California.
Metallurgical practice in the Porcupine district (Arizona?)
Underground haulage by storage battery locomotives in the Bunker Hill and Sullivan Mine.
Testing and application of hammer drills.
Mining methods of the Arizona Copper Company.
Mining Methods at Park City, Utah.
Hydro-electric development of the Peninsular Power Company.
Safety methods and organization of United States coal and Coke Company.
Housing and sanitation at Mineville.
Development of the Butchart Riffle system at Morenci.
Investigations of sources of Potash in Texas.
Petroleum fields of Alaska.
Dehydrating Oil Plant of Nevada Petroleum Company, California.
Improved methods of deep drilling in the Coalinga Oil field, California.
Gasoline from “Synthetic” crude oil.
Gold bearing gravels of Beauce county, Quebec.
Copper smelting in Japan.
Coal dust fired reverberatories at Washoe reduction works.
Coal dust fired reverberatory furnaces of Canadian Copper Company.
Reverberatory smelting practice of Nevada Consolidated Copper Company.
High blast heats in Mesaba practice.
Modern gas power blower stations.

Notes on Homestake Metallurgy.
Metallurgical practice in the Witwatersrand district, South Africa.
Slime agitation and solution replacement methods at the West End Mill, Tonopah, Nevada.
Tonopah plants of the Belmont Milling Company.
Cyaniding practice of Churchill Milling Company, Wonder, Nevada.
Recovery of mercury from amalgamation tailing, Buffalo mines, Cobalt.
Electric furnace for gold refining at the Alaska – Treadwell cyanide plant.
Important topping plants of California.
Protecting California oil fields from damage by infiltrating water.
Possible occurrence of oil and gas fields in Washington.
Furbero Oil Field, Mexico.
Sliding royalties for oil and gas wells.
Correlation and geological structure of the Alberta oil fields.
Gasoline from “Synthetic” crude oil, continuation.
Underground mining systems of Ray consolidated Copper Company.
Mining conditions on the Witwatersrand, South Africa.
Churn-drilling costs, Sacramento Hill, Arizona.
Tramming and hoisting at Copper Queen Mine, Arizona.
Ventilation of the Copper Queen Mine.
Fire fighting methods at the Mountain View Mine, Butte, Montana.
Geology of the Burro Mountains Copper District, New Mexico.
Copper deposits of San Cristobal, Santo Domingo.
The Salida Smelter, Colorado.
Lead Smelting at El Paso.
Mellen rod casting machine.
Concentrator of the Timber Butte Milling Company, Butte, Nevada.
Hardinge Mill Data.
British Columbia Copper Company’s smelter, Greenwood, British Columbia.

 

Geology of the iron ore deposits in and near Daiquiri, Cuba.
Iron deposits of Daiquiri, Cuba.
Genesis and relations of the Daiquiri and Firmeza iron ore deposits, Cuba.
Iron mines of the Sierra Menera district of Spain.
Iron ores of the Philippine Islands.
Formation and distribution of bog iron ore deposits.
Metallography of steel for United States Naval Ordnance.
Pacific coast iron situation : iron ores of California and possibilities of smelting.
Electric furnace in the Foundry.
Duplex process of Steel manufacture at the Maryland Steel Works.

Illumination of mines.
Broken Hill underground mining methods.
Underground Mining methods of Utah Copper Company.
Electro-hydraulic shovel.
New electric hoist of the North Butte Mining Company.
Researches on fire damp.
Stresses in the Mine roof.
Evolution of drilling rigs.
Geology of the ore deposits of the Tintic mining district.
Disseminated copper ores of Bingham Canyon, Utah.
Newman Hearth.
Segregation in gold bullion.

Manganese ores of the Lafayette district, Minas Geraes, Brazil.
Manganese ores of Russia, India, Brazil and Chile.
Geology of the iron ore deposits of the Firmeza district, Orient province, Cuba.
Recent geologic developments on the Mesabi iron range, Minnesota.
Geology of the Bawdwin mines, Burma.
Geology and ore deposits of Mohave county, Arizona.
Modern methods of mining and ventilating thick pitching beds.
Illuminating power of safety lamps.

Mining methods of the American Zinc Company of Tennessee.
History and legal phases of the smoke problem.
Pyritic deposits near Roros, Norway.
Sulphur deposits in Culberson county, Texas.
Ore deposits of the Boulder batholith of Montana.
Erosion of guns.
Manganiferous iron ores of the Cuyuna district, Minnesota.

Chilean nitrate industry.
Pyrite and pyrrhotite resources of Ducktown, Tennessee.
Ore deposits of the Yellow Pine mining district, Clark county, Nevada.
Wisconsin zinc district.
United Eastern Mining and Milling plant.
Otis passenger elevator at Inspiration shaft.
Branch raise system at the Ruth Mine, Nevada Consolidated Copper Company.
Measures for controlling fires at the Copper Queen Mine.
Drifton breaker.
The crippled soldier in industry.
Mine labor and accidents.
Illness in industry – its cost and prevention.

First year of leaching by the New Cornelia Copper Company.
Elko Prince mine and mill.
Symposium on the conservation of tin (8 papers).
Automatic copper plating.
Radium.
Use of cripples in industry.
Mental tests in industry.
Prevention of illness among employees in mines.
Practice of Antimony smelting in China.
Roasting for amalgamating and cyaniding Cripple Creek sulfo-telluride gold ores.
Two instances of mobility of gold in solid state.

Petrographic notes on the ore deposits of Jerome, Arizona.
Pyrite deposits of Leadville, Colorado.
Molybdenite operations at Climax, Colorado.
Air blasts in the Kolar gold field, India.
Limonite deposits of Mayaguez Mesa, Puerto Rico.
Recent geologic development on the Mesabi iron range, Minnesota.
Mining methods at United Verde Extension Mining Company.
Fireproofing mine shafts of the Anaconda copper Mining Company.
Engineering problems encountered during recent mine fire at Utah – Apex mine, Bingham canyon, Utah.
Tailing excavator at plant of New Cornelia Copper Company, Ajo, Arizona.
Carbocoal.

Several papers on gun forgings and rifle barrels.
Water cooled equipment for open hearth furnaces.
Blast furnace refractories.
Aircraft Steels.
Experimental data obtained on Charpy impact machine.
Production of ferromanganese in the blast furnace.
Includes biographical notices for Andrew Carnegie, J.E. Johnson, Jr., Henry C. Frick and S.T. Wellman.

Heat treatment and constitution of Duralumin.
Deterioration of Nickel spark-plug terminals in service.
Tin fusible boiler plug manufacture and testing.
Manufacture and electrical properties of Constantan.
Manufacture and electrical properties of Manganin.
Five foundry test of zinc bronzes.
Electrolytic zinc plant of Anaconda Copper Mining Company, at Great Falls, Montana.
Treatment tests on ores of Consolidated Coppermines Company.

Petroleum industry of Trinidad.
Geology of Cement oil Field.
Irvine oil district, Kentucky.
Petroliferous rocks in Serra da Baliza.
Drilling and production technique in the Baku oil fields.
Production data from oil fields the US States and various foreign countries

An experiment in one-piece gun contruction.
Manufacture of semisteel for shells.
A number of papers on guns and ordnance.
Graphitization and malleableizing of White cast iron.
Thacher molding process for propeller wheels and blades.

Porcupine Ore Deposits.
Magnesite deposits of Grenville, Quebec.
Cherts and igneous rocks of the Santa Elena oil field, Ecuador.
Heap leaching at Bisbee, Arizona.
Mining methods at Bawdwin Mine.
Rove tunnel.
Liquid oxygen explosives at Pachuca.
Loading ore underground with scrapers at the Utah-Apex Mine.
Some problems in ground movement and subsidence.
Subsidence at Miami, Arizona.
Examples of subsidence in two Oklahoma coal mines.
Mine drainage stream pollution.
Design and operation of Roberts Coke oven.
Heat distribution in new type Koppers Coke oven.
Sunburst oil and gas field, Montana.

Nature of Martensite.
Some low copper-nickel silvers.
Effect of severe cold working on scratch and Brinell hardness.
Reduction and refining of tin in the United States.
Greenawalt electrolytic copper extraction process.
Ammonia leaching of Calumet and Hecla tailings.
Timber used in bituminous coal mining.
Development of mine transportation in Clifton-Morenci district.
Ores in the limestones at Bingham, Utah.
Petrographic studies of limestone alterations at Bingham.
Some geological features and court decisions of the Utah-Apex and Utah Consoliated controversy.
Magnetite deposits of Easter Puerto Rico.
South Lorrain Silver district, Ontario.
Smackover oil field, Ouachita and Union counties, Arkansas.

Mascot, Tennessee, Zinc area.
Ducktown, Tennessee, Copper District.
Notes on the Clinton group in Alabama.
Manganiferous iron ores of Cuyuna district, Minnesota.
Milling practice of American Zinc Company of Tennessee at Mascot.

Miami Copper company method of mining low grade orebody.
Vertical and incline shaft sinking at North Star Mine.
Some recent developments in open-pit mining on the Mesabi range.
Protective measures against gas hazards at United Verde Mine.
Development and installation of the Hawkesworth detachable bit.
Observation on ground movement and subsidences at Rio Tinto mines, Spain.
Electrolytic cadmium plant of Anaconda Copper Mining Company at Great Falls, Montana.
Lead refining at the Bunker Hill Smelter of the Bunker Hilll & Sullivan Mining & Concentrating Company.
Present status of the quicksilver industry – symposium.
Progress in production and use tantalum.

Mining methods and costs at Presidio mine of the American Metal Company of Texas.
Ventilation at the Portovelo mines, Ecuador.
Operation of pressure fans in series.
High silica retorts at the Rose Lake Smelter.
Application of the wire saw in marble quarrying (Saint Clair Marble Company, Guion, Arkansas.
Barite in California.
Chivor – Somondoco Emerald mines of Colombia.
Age and structure of the vein systems at Butte, Montana.
Geology of the Parral area of the Parral district, Chihuahua, Mexico.
Zonal relations of the lodes of the Sumpter Quadrangle.
Occurrence of Quicksilver orebodies.
Gold supply symposium – 5 papers.

Propeller type mine fan at Moose shaft, Butte, Montana.
Quarry waste in the Indiana limestone district.
Results of wire saw test.
Ore deposits of the tri-state district (Missouri, Kansas, Oklahoma).
Prospecting for gold in the shield areas of Canada, Siberia, Southern Rhodesia and Western Australia.

 

Kettleman Hills Middle Dome Unit Plan.
Recent changes in reservoir pressure conditions in the East Texas Field.
Characteristics of edge-water encroachment in California oil fields.
Method of prorating old oil and gas fields by pressure control.
Development of the Grande Ecaille sulfur deposit.
Production data from oil fields the US States and various foreign countries

Choose your copy of Vol. 142 :
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Volumetric behavior of oil and gas from the Rio Bravo Field.
Development and application of subsurface pressure data in Kettleman Hills.
Production data from oil fields the US States and various foreign countries

Mining and transportation practice in Minnesota iron mines.
Modified mining methods in the United Verde Mine.
Improvements in mining practice in the Butte district.
Mining practices of the St. Joseph Lead Company in southeast Missouri.
Mine drainage, southeast Missouri Lead district.
Development of the low grad manganese ores of Cuba.
Driving a 540 foot raise at Nivloc, Nevada.
Development and dewatering practice at Park City Consolidated Mines.
Trucking operations at New Cornelia Mine.
Development of Tractor and airplane transportation in Manitoba.
Operation of Diesel locomotives underground.
Ventilation of the Climax mine, Colorado.
Electric blasting practices of the Tennessee Copper Company.
Heavy media separation plant of the Barton Mines Corporation.
Climax Milling practice.
Milling practice of the St. Joseph Lead Company.
Ohio Copper Company tailings re-treatment plant.
Results in the Duquesne Mill of the Callahan Zinc-Lead Company.
Milling methods at the Lead-Zinc concentrator of Compania Minera de Penoles, at Avalos, Zacatecas, Mexico.
Metallurgy and milling practice at Getchell Mine.
Launders.

Changes and improvements in modern copper smelting.
History of developments in direct smelting at the McGill plant of the Nevada Consolidated Copper Corporation.
New reverberatory waste heat boiler and power plant at Douglas Smelter.
Clarkdale method of hot-patching operating furnaces.
Recovery of gold from Balbach-Thum slimes at Copper Cliff, Ontario.
Pneumatic conveying at Giesche Spolka Akcyjna, Poland.
Production of Electrothermic zinc at Josephtown smelter.
Weaton-Najarian vacuum condenser.
New electrolytic zinc plant of the American Zinc company of Illinois.
Electrolytic zinc at Corpus Christi, Texas.
The Kalunite process.
Process improvements at the Henderson plant of Basic Magnesium.
Production of magnesium by the carbothermic process at Permanente.
First two years operation of the Bureau of Mines Electrolytic Manganese Pilot Plant at Boulder City, Nevada.
Clilmax conversion practice.
Electric smelting of Cle Elum-Blewett Pass Nickeliferous ores.
Recovery of selenium and tellurium at Copper Cliff, Ontario.
Tin smelting and metallurgy.

Corrosion of yellow brass pipes in domestic hot water systems.
Substitute soldiers of the 15-85 tin-lead type.
Symposium on creep of nonferrous metals and alloys (6 papers plus discussions).
Symposium on continuous casting (6 papers plus discussion).
Conference on production and design limitations and possibilities for powder metallurgy parts (12 papers plus discussions).

Fluorspar deposits in the Western States.
Discoveries of Potash in eastern Utah.
Owens Lake, California – source of sodium minerals.
Barite deposits of central Missouri.
Prospecting for Fire Clay in Missouri.
Methods of prospecting and mining optical calcite in Montana.
Symposium on prospecting for phosphate.
Prospecting for Potash in the Permian basin area near Carlsbad, New Mexico.
Mining operations of the Montana Phosphate Products Company.
Retreatment of Corundum tailings at Craigmont, Ontario.
Concentrating operations of the Mahoming Mining Company, Rosiclare, Illinois.
Magnesium from Olivine.
New cement plant of the Universal Atlas Cement company at Northampton, Pennsylvania.
Mining and treatment of clay near Mt. Holly Springs, Pennsylvania.
Glass sand and a glass industry in Puerto Rico.
New England Mica Industry.
“Bonanza” mica operation of Purdy Mica Mines, Mattawan township, Ontario.
Use of fibrous glass by the Army and Navy.
Occurrence and uses of Wollastonite from Willsboro, New York.

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