Economic geology of Gilpin county and adjacent parts of Clear Creek and Boulder counties, Colorado - Bastin, Edson Sunderland b. 1878.; Hill, James M. (James Madison) 1884-. (Washington Govt. Print. Off., 1917)
At head of title: Department of the interior.
Some plates printed on both sides of the leaf.
Nine plates are in pocket.
Includes index.
Keywords: Mines and mineral resources -- Colorado -- Boulder County; Mines and mineral resources -- Colorado -- Clear Creek County; Mines and mineral resources -- Colorado -- Gilpin County; Geology -- Colorado