TY  - BOOK
AU  - Emmons,William H.
TI  - The enrichment of ore deposits
T2  - U. S. Geological survey.  Bulletin  625
AV  - TN263 .E48
PY  - 1917///
CY  - Washington
PB  - Govt. print. off.
KW  - Ore deposits
N1  - At head of title: Dept. of the interior; Bibliography: p. 20-33
ER  -