TY  - BOOK
AU  - Frisch, Joseph C.
TI  - Extension and comprehesion in logic
U1  - 160 FRI 
PY  - 1969///
CY  - New York
PB  - Philosophical Library
KW  - Extension (Logic)
KW  - Comprehension
KW  - Logic
N1  - Includes bibliography
ER  -