Search U.S. government technical reports digitized or harvested by TRAIL.
Methods and costs of mining at Hartley-Grantham mine, Tri-State zinc and lead district
The mineral industry and the young engineer
Construction of the Wachusett-Coldbrook Tunnels
Factors governing the selection of the proper level interval in underground mines
Milling methods and costs at the Hillside Fluorspar mines, Rosiclare, Ill.
Mining and technology graduates and their problems
Dry cells and their application to mining
The design of small wooden head frames
Strategic minerals investigations :procedure followed by the Bureau of Mines