TY  - BOOK
AU  - 
TI  - Laws of form
SN  - 0963989901
AV  - QA9 .S63 1972
U1  - 511/.3 
PY  - 1972///]
CY  - New York
PB  - Julian Press
KW  - Logic, Symbolic and mathematical
N1  - Bibliography: p. 136-137
ER  -