TY  - BOOK
AU  - Nidditch P H
TI  - Propositional calculus
T2  - monographs in modern logic ed by G B Keene
U1  - R14, K25 (TTR) 
PY  - 1962///
CY  - London
PB  - Routledge and Kegan Paul Ltd U. K. 
KW  - PHILOSOPHY
ER  -