TY  - BOOK
AU  - Webster,Robert
AU  - Anderson,B.W.
TI  - Gems: their sources, descriptions and identification 
SN  - 0408011483
PY  - 1983///
CY  - London
PB  - Butterworths
KW  - Precious stones
N1  - Includes index; Previous ed.: London : Newnes-Butterworths, 1975
ER  -