TY  - BOOK
AU  - Gustason, William.
AU  - Ulrich, Dolph E.,
TI  - Elementary symbolic logic
SN  - 0030046165
AV  - BC135 .G84
U1  - 164 
PY  - 1973///
CY  - New York
PB  - Holt, 
KW  - Logic, Symbolic and mathematical
N1  - Includes bibliographical references
ER  -