TY  - BOOK
AU  - John Sinkankas
TI  - Van Nostrand's standard catalog of gems
SN  - 0-442-07618-5
U1  - 736.2028016 Sin 
PY  - 1968///
CY  - Van Nostrand Reinhold, New York
KW  - Polytechnic - Jewellery
ER  -