TY  - BOOK
AU  - Tyrrell, G W. 
TI  - Principles of petrology
SN  -  9780412215001
U1  - 552 
PY  - 1958///
CY  - London
PB  - Methuen and Co
KW  - Petrology
KW  - Igneous rocks
KW  - Sedimentary rocks
N1  - Includes bibliographic references and index
ER  -