TY  - BOOK
AU  - Mates,Benson
TI  - Elementary logic
SN  - 019501491X
AV  - BC135 .M37 1972
U1  - 511/.3 
PY  - 1972///
CY  - New York
PB  - Oxford University Press
KW  - Logic, Symbolic and mathematical
N1  - Bibliography: p. 231-232
ER  -