TY  - BOOK
AU  - Tyrrell,G.W.
TI  - The principles of petrology: an introduction to the science of rocks
SN  -  8172250177
U1  - 552 
PY  - 1998///
CY  - New Delhi
PB  - B.I. Pub.
KW  - Petrology
KW  - Rocks
KW  - Physical geology
KW  - Geograaphy
ER  -