TY  - BOOK
AU  - Dietrich, R. V.
AU  - Skinner, Brian J.
TI  - Gems, granites, and gravels: knowing and rocks and minerals 
SN  - 0521344441
AV  - QE363.2 .D52 1990
PY  - 1990///
CY  - New York
PB  - Cambridge University Press
KW  - Geology
KW  - Gems, granites, gravel
N1  - includes bibliographical references and index
ER  -