TY  - BOOK
AU  - Hurlbut,Cornellius S.(Cornelius Searle)
AU  - Switzer,George S
TI  - Gemology
SN  - 047142224X
PY  - 1979///
CY  - New York
PB  - John Wiley & Sons
KW  - Precious stones
N1  - 'A Wiley-Interscience publication'; Includes bibliographies
ER  -