Search U.S. government technical reports digitized or harvested by TRAIL.
Entry of solutions into ores during leaching.
Microscopic study of Elkhorn coal bed at Jenkins, Letcher county, Ky.
Safety at the Old Dominion copper mine, Globe, Ariz.
Mine explosions and fires in the United States during the fiscal year ending June 30, 1931
List of permissible mine equipment
Feldspar gems :(Amazon stone, Moonstone, Sunstone, etc.)
Practical rules for the use of the magnetometer in geophysical prospecting
Mining practices, methods, and costs at Elkoro mines, Jarbidge, Nev.
Deep mining methods, conglomerate mine of the Calumet and Hecla Consolidated Copper Co.
The Bureau of Mines coal-sampling truck
Mining, treatment, methods, and costs at the East Texas Gravel Co.'s deposits near Bois D'Arc, Tex.
Fatal accidents in Alabama coal mines during 1930
Safety education at iron mines of the Lake Superior region
Mining laws of Ethiopia (Abyssinia)
Mining practice and costs of the Vipond Mine, Timmins, Ontario
Methods and costs of concentrating tungsten ores at Atolia, San Bernardino County, Calif.
Official changes in the active list of permissible explosives and blasting devices for August, 1930
Rock-dusting a Pennsylvania coal mine
Consumption of explosives in November, 1930 /W.W. Adams and L.S. Gerry.
Flotation of low-grade phosphate ores.
Smelting in the lead blast furnace :handling rich charges.
Gases in manholes :a survey of a utility in Boston, Mass.
Consumption of explosives in February, 1931
Consumption of explosives in March, 1931
Comparison of storage-battery and cable-reel gathering locomotives in a West Virginia coal mine
Official changes in the active list of permissible explosives and blasting devices for June, 1931
Sand-and-gravel safety contest of 1930
Official changes in the active list of permissible explosives and blasting devices for October, 1931
Twenty live reasons for first-aid training in California
Coal-Mine Fatalities in April, 1931
Coal-Mine Fatalities in December, 1930
Coal-Mine Fatalities in February, 1931
Coal-Mine Fatalities in June, 1931
Coal-Mine Fatalities in May, 1931
Coal-Mine Fatalities in March, 1931
Coal-Mine Fatalities in November, 1930
Leaching Oxidized Copper Ores: Effect of Strength of Acid in Leaching Solvent