TY  - BOOK
AU  - Dietrich, Richard Vincent
AU  - Skinner, Brian J
TI  - Gems, granites, and gravels : knowing and using rocks and minerals
SN  - 9780521107228
U1  - 549 DIE 
PY  - 2009///
CY  - Cambridge
PB  - Cambridge University Press
N1  - Includes bibliographical references and index
ER  -