00283nam a2200121Ia 4500008004100000100001500041245002800056260002800084300000900112650001600121942000700137999001700144190216s9999||||xx |||||||||||||| ||und||  aSigler L E 0aExercises In Set Theory  bNarosa Pubs Housec1979  a134p  aMathematics  cBK  c30609d30609