TY  - GEN
AU  - Hurlbut,Cornelius S.
AU  - Switzer,George S.
TI  - Gemology
U1  - 553.8  
PY  - 1979///
CY  - New York
PB  - John Wiley and Sons
KW  - Economic Geology
KW  - Gem Deposites
KW  - Gemology
ER  -