Browse TRAIL Inventories

Hydraulic tunneling in St. Peter sandstone at Minneapolis, Minn.

Carbide insert bit drilling at the Cleveland-Cliffs Iron Co. mines, Ishpeming, Mich.

Tunnel construction by peripheral sawing at the Fort Randall Reservoir, Pickstown, S. Dak.

Ventilation-air heating plants of the Menominee Range

Bureau of Mines test procedures for rocks,


Published Year

Subject

Author