TY  - BOOK
AU  - Pirsson,Louis V.
AU  - Knopf,Adolph
TI  - Rocks and rock minerals
AV  - QE431 .P68 1947
U1  - 552 
PY  - 1947///]
CY  - New York
PB  - J. Wiley
KW  - Petrology
UR  - http://www.archive.org/details/rocksrockmineral00pirs
ER  -