TY  - BOOK
AU  - Dictrich, R.V.
TI  - Gems granites and gravels: knowing and using rocks and minerals
SN  - 521344441
U1  - 549 
PY  - 1990///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Pearls
KW  - Rocks, Igneous
ER  -