TY  - GEN
AU  - Gustason,William
AU  - Ulrich,Dolph E.
TI  - Elementary symbolic logic
SN  - 088133412X
AV  - BC135 GUS 1989 
PY  - 1989///
CY  - Illinois
PB  - Waveland press.
KW  - Logic, Symbolic and mathematical
N1  - Includes bibliographical references; Includes bibliographical references
ER  -