TY  - BOOK
AU  - WILLIAMS, HOWEL Y OTROS
TI  - PETROGRAPHY
T2  - 0
U1  - 552 
PY  - 1954///
CY  - SAN FRANCISCO-U.S.A.
PB  - FREEMAN AND COMPANY
KW  - CIENCIAS PURAS
N1  - ROCKS IGNEOUS-METAMORPHIC/ROCKS SEDIMENTARY
ER  -