00289    a2200109   4500082001500000100001700015245003500032260004700067300002300114650002300137700001900160  a511.3bBAS  aBasson, A.H.  aIntroduction to symbolic logic  aDelhibOxford University pressc1953g1992  aviii, 175p.c18cm.  aMathematical logic  aO'Connor, D.J.