TY  - BOOK
AU  - Emmons,William H.
TI  - The enrichment of sulphide ores
T2  - U.S. Geological survey. Bulletin 529
AV  - QE75 .B9 no. 529
PY  - 1913///
CY  - Washington
PB  - Govt. Print. Off.
KW  - Sulfides
N1  - Includes index
ER  -