Ebook: Contributions to economic geology, 1903

Placer mining in Alaska in 1903 / A.H. Brooks -- Quartz veins in Maine and Vermont / G.O. Smith -- Ore deposits of the northern Black Hills / J.D. Irving -- Notes on the copper mines of Vermont / W.H. Weed -- Lead and zinc deposits of Illinois / H.F. Bain -- The Lake Superior iron region during 1903 / C.K. Leith -- Iron ores in southern Utah / C.K. Leith -- The Cumberland Gap coal field / G.H. Ashley -- Lignites of the middle and upper Missouri Valley / E.F. Burchard -- The Barnesboro-Patton coal field of central Pennsylvania / J.S. Burrows -- Petroleum fields of Alaska and the Bering River coal field / G.C. Martin -- Slate deposits of California and Utah / E.C. Eckel -- Cement resources of Alabama / E.A. Smith -- Clays of the Ohio Valley in Pennsylvania / L.H. Woolsey -- Salt industry of Utah and California / E.C. Eckel -- Fluorspar deposits of southern Illinois / H.F. Bain -- Graphite in the eastern Adirondacks / J.F. Kemp.