Search U.S. government technical reports digitized or harvested by TRAIL.
Hot milling of rock-drill bits at the mines of the Vinegar Hill Zinc Co., Platteville, Wis.
Underground mill at the Doyle Mine, Shullsburg, Wis.
Dust produced by drilling when water is sprayed on the outside of the drill steel
Mount Weather testing adit :progress report 1
Relative air dustiness during cycle of operations at Mount Weather Testing adit
Comparison of manganese steel with carbon steel for detachable-bit drill rods
Effect of lubricating agents in a diamond-drilling-bit coolant and cuttings-removal medium
Diamond drilling and diamond bit investigation.
Yancey-Crawford manganese deposit, Rockingham County, Va.
Watson manganese deposit, Page County, Va.