Search U.S. government technical reports digitized or harvested by TRAIL.
Missouri Valley Manganese Deposits :South Dakota.
Investigation of Oriskany iron-ore depositsAlleghany, Bath, Botetourt, and Craig counties, Va.
Iowa coals as a source of sulfur
Zinc-ore mining and milling methods, Piquette Mining and Milling Co., Tennyson, Wis.