TY  - BOOK
AU  - Pedersen, Maggie Campbell  .
TI  - Gem and ornamental materials of organic origin / 
SN  - 0-7506-58525
U1  - J1.55 
PY  - 2004///
CY  - Oxford : 
PB  - Elsevier Ltd. , 
KW  - Ornamental materials
ER  -