TY  - BOOK
AU  - Ehlers Ernest G
AU  -  Blatt Harvey
TI  - Petrology: Igneous sedimentary and metamorphic
U1  - H2, M2 
PY  - 1982///
CY  - San Francisco 
PB  -  W H Freeman      
KW  -  Petrology-Indian
KW  - Geology
ER  -