U.S. Bureau of Mines, 1927-33, Mineral resources of the United States [annual volumes for the years 1924-31]: Washington, D.C., U.S. Government Printing Office.
U.S. Bureau of Mines
Washington, D.C., U.S. Government Printing Office.
Mineral District, Production, Copper, Lead, Zinc, Gold, Silver, Molybdenum, Manganese, Tungsten,