00378nam a2200157Ia 4500008004100000020000900041035000900050082001900059100003500078245003500113250000600148260004300154300000800197500000900205650000600214210723s9999||||xx |||||||||||||| ||und||  aNULL  a2743  a164BBAS / OCO  aBasson, A. H. / Oconnor, D. J. 0aIntroduction To Symbolic Logic  a-  aLondonbUniversity Tutorial Press Ltd.  a175  a1404  a-