TY  - BOOK
AU  - George,Russell D.
TI  - Common minerals and rocks,: their occurrence and uses,
T2  - Colorado. Geological survey. Bulletin 6
AV  - QE91 .A4 no. 6
PY  - 1913///
CY  - Denver, Col.
PB  - The Smith-Brooks printing co.
KW  - Mineralogy
KW  - Colorado
KW  - Petrology
ER  -