TY  - BOOK
AU  - Dietrich,Richard Vincent
AU  - Skinner,Brian J.
TI  - Gems, granites, and gravels: knowing and using rocks and minerals 
SN  - 0521344441
AV  - QE363.2 .D52 1990
U1  - 549 20
PY  - 1990///
CY  - Cambridge, New York
PB  - Cambridge University Press
KW  - Mineralogy
KW  - Petrology
N1  - Includes bibliographical references and index
ER  -