TY  - BOOK
AU  - Tyrrell, G.W..
TI  - Principles of Petrology: an Introduction to the Science of Rocks / 
U1  - H2 
PY  - 2003///
CY  - New Delhi-110001 : 
PB  - B.I. PublicationsPvt. Ltd. , 
KW  - Geology <Petrology>
ER  -