000 00282pam a2200121a 44500
082 _a512.817
_bZe32e
100 _aZehna P.W.
245 1 _aElements of set theory
260 _aBoston
_bAllyn And Bacon
_c1962
300 _axiv, 194p.
650 _aMathematics
997 _a20361 W
999 _c449153
_d449153