TY  - BOOK
AU  - Webster,Robert
TI  - Gemmologists' compendium
U1  -  549.02 
PY  - 1938///
CY  - New York
PB  - Van Nostrand Reinhold
KW  - Precious stones
N1  - Originally published in 1937 by N. A. G. Press, London, under title: The gemmologists' pocket compendium
ER  -