TY  - BOOK
AU  - Pirsson , Louis V
TI  - Rocks  and rock minerals
U1  - 551.3 
PY  - 1949///
CY  - NewYork
PB  - John Willey 
KW  - Geology,Hydrology, Meteorology
KW  - Petrology
N1  - Includes index
ER  -