TY  - BOOK
AU  - Tyrrell,G.W.
TI  - The principles of petrology: An introduction to the science of rocks 
SN  - 041211500X
U1  - 552 21
PY  - 1926///[Reprinted 1967,1975, 1977]
CY  - London
PB  - Chapman and hall
KW  - Petrology
N1  - Includes index
ER  -