TY  - BOOK
AU  - George,Russell D.
TI  - ... Common minerals and rocks,: their occurrence and uses,
T2  - Colorado, Geological Survey, Bulletin 12
AV  - QE91 .A4 no. 12
PY  - 1917///
CY  - Denver, Colo.
PB  - Eames bros., state printers
KW  - Mineralogy
KW  - Petrology
ER  -