The enrichment of ore deposits /
Emmons, William H. 1876-
The enrichment of ore deposits / by William Harvey Emmons. - Washington : Govt. print. off., 1917. - 530 p. : ill., vii pl (1 fold) diagr., ; 24 cm. - U. S. Geological survey. Bulletin 625. .
At head of title: Dept. of the interior.
Bibliography: p. 20-33.
gs 17000189
Ore deposits.
TN263 / .E48
The enrichment of ore deposits / by William Harvey Emmons. - Washington : Govt. print. off., 1917. - 530 p. : ill., vii pl (1 fold) diagr., ; 24 cm. - U. S. Geological survey. Bulletin 625. .
At head of title: Dept. of the interior.
Bibliography: p. 20-33.
gs 17000189
Ore deposits.
TN263 / .E48