TY  - BOOK
AU  - TYRRELL, G.W.
TI  - THE PRINCIPLES OF PETROLOGY
T2  - 0
U1  - 552 
PY  - 1997///
CY  - NEW YORK-U.S.A.
PB  - METHUEN
KW  - CIENCIAS PURAS
N1  - IGNEAUS-ROCKS
ER  -