COLORADO FERBERITE AND THE WOLFRAMITE SERIES; GEOLOGICAL SURVEY BULLETIN 583
Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1914. Soft cover. 75 pages with tables, charts and diagrams, plus fourteen photographic plates. Bound in original gray paper covers with lettering printed in black. Corner crease to the front cover. A very good copy. More