TY  - BOOK
AU  - Kraus, Edward Henry
AU  - Slawson, Chester Baker
TI  - Gems and gem materials
U1  - 553.8 
PY  - 1941///
CY  - New York
PB  - McGraw-Hill
KW  - Precious stones
N1  - Copy price USD 1.50 (1 USD = LKR 159.74 as at 03.07.2018)
ER  -