TY  - BOOK
AU  - Tyrrell,G.W.
TI  - The principles of petrology : : an introduction to the science of rocks
U1  - 552   
PY  - 1960///
CY  - Bombay : 
PB  - Asia Publishing House
KW  - Petrology
KW  - Principles of petrology
KW  - Science of rocks
ER  -