TY  - BOOK
AU  - Dietrich, Richard Vincent
TI  - Gems, granites, and gravels: knowing and using rocks and minerals 
SN  - 0521344441
AV  - QE 363.2 Die 
PY  - 1990///
CY  - Cambridge
PB  - Cambridge University Press
KW  - MINERALOGY
KW  - PETROLOGY
ER  -