TY  - BOOK
AU  - Pearl, Richard M.
TI  - How to know the minerals and rocks /Richard M. Pearl
U1  - 550 
PY  - 1955///
CY  - New York
PB  - A Signet Key Book
KW  - Earth sciences
KW  - Earth science
KW  - Mineral
KW  - Rock
ER  -