000 00275nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aSinger (LE)
245 0 _aExercies in set theory
260 _b"Narosa, New Delhi"
260 _c1979
365 _b15.00
942 _cBK
999 _c203698
_d203698