TY  - BOOK
AU  - Pirsson,Louis V.(Louis Valentine)
AU  - Knopf,Adolph
TI  - Rocks and rock minerals: a manual of the elements of petrology with out the use of the microscope 
AV  - QE431 P57 1935
PY  - 1935///
CY  - New York
PB  - John Wiley
ER  -