TY  - BOOK
AU  - Spock , L . E.
TI  - Guide to the study of rocks
U1  - 552 
PY  - 1962///
CY  - NewYork
PB  - Harper 
KW  - Petrology -
KW  - Petrology - Properties , composition , analysis structures  of rocks -
N1  - Includes bibliographical refererences , appendices and index
ER  -