The oxidized zinc ores of Leadville, Colorado,
Loughlin, G. F. 1880-1946.
The oxidized zinc ores of Leadville, Colorado, by G. F. Loughlin. - Washington, Govt. print. off., 1918. - 91 p. VIII pl. (part fold.; incl. map, diagrs.) diagrs. 24 cm. - U.S. Geological survey. Bulletin 681 .
At head of title: Department of the interior.
gs 19000035
Zinc mines and mining--Colorado.
QE75 / .B9 no. 681
The oxidized zinc ores of Leadville, Colorado, by G. F. Loughlin. - Washington, Govt. print. off., 1918. - 91 p. VIII pl. (part fold.; incl. map, diagrs.) diagrs. 24 cm. - U.S. Geological survey. Bulletin 681 .
At head of title: Department of the interior.
gs 19000035
Zinc mines and mining--Colorado.
QE75 / .B9 no. 681