TY  - BOOK
AU  - Tyrrell, G. W.
TI  - The Principles of  petrology
U1  - 552 
PY  - 1926///
CY  - London
PB  - Methuen and co.
KW  - Petrology -
KW  - Petrology-principles -
N1  - Reprinted 1967
ER  -