TY  - BOOK
AU  - Hewett,Donnel Foster
TI  - Silver in veins of hypogene manganese oxides,
T2  - Geological Survey circular 553
AV  - QE75 .C5 no. 553
U1  - 553/.462 
PY  - 1968///
CY  - Washington
PB  - [U.S. Geological Survey]
KW  - Manganese ores
KW  - Southwest, New
KW  - Canada
KW  - Ore deposits
N1  - Bibliography: p. 8-9
ER  -