Copper Deposits of Part of Helvetia Mining District, Pima County, Arizona
Subtitle: Description and Maps of Four Mines Typical of the District : A Contribution to Economic Geology.
Contributors: Creasey, S.C.; Quick, G.L.
Series: U.S. Geological Survey bulletin -- 1027F
Publisher: s.n
Published: 1955
Place of publication: S.l
Language: eng
Notes: 1