TY  - BOOK
AU  - Mastin,John
TI  - The Chemistry, Properties and Tests of Precious Stones
AV  - QE 
PY  - 2007///
PB  - Project Gutenberg
KW  - Precious stones
N1  - Public domain in the USA; Electronic text
UR  - http://www.gutenberg.org/ebooks/23626
ER  -