Search U.S. government technical reports digitized or harvested by TRAIL.
Nonmetallic mineral industries in 1939
Limestone and dolomite in the chemical and processing industries
A quarter century of mechanized mining:notes on permissibility
Stemming in metal mines :progress report 7
Prospect trenching with caterpillar-mounted angledozers
Diamond-drilling blast holes, eastern Magnetite Mine A
Blue Bell fluorite deposits, Beaver County, Utah
Good Fortune Iron Mine, Platte County, Wyo.
The determination of low concentrations of hydrogen sulfide in gas by the methylene blue method