Search U.S. government technical reports digitized or harvested by TRAIL.
Progress report on investigation of detachable rock-drill bits
Progress report no. 2 on investigation of detachable rock-drill bits
Progress report 4 on investigation of detachable rock-drill bits
Progress report no. 3 on investigation of detachable rock-drill bits
Inspection and maintenance of mine hoisting ropes
Mount Weather testing adit :progress report 1
Operations at the Haile Gold Mine, Kershaw, S.C.
Exploration for war minerals (through fiscal year 1942)
Bureau of Mines exploration of mercury deposits to June 30, 1944
Diamond-drilling blast holes, eastern Magnetite Mine A
Diamond drilling blast holes, Balmat Mine, St. Lawrence County, N.Y.
Diamond-drilling blast holes, eastern magnetite "Mine B"
Shaft sinking by diamond drilling, Bellefonte mine, National Gypsum Co., Centre County, Pa.
A skull breaker in a limestone quarry
Certain magnetite deposits in New Jersey
Bamford zinc mine, Lancaster County, Pa.
Investigation of the Ore Hill zinc-lead mine, Grafton County, N.H.
West Portal magnetite mines, Hunterdon County, N.J.
Diamond drilling blast holes, Bell Mine, the Warner Co., Centre County, Pa.
Diamond-drilling blast holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa.
Diamond-drilling blast holes, Eastern Magnetite Mine C
Investigation of wood chromite mine area Lancaster County, Pa.
Investigation of Ely mine copper deposit Orange County, Vt.
Investigation of Portland beryl-mica district Middlesex County, Conn.
Investigation of Anson Betts manganese mine, Hampshire County, Mass.
Investigation of Black Mountain beryl deposit Oxford County, Maine