000 00286nam a2200121Ia 4500
008 160710s1979 xx 000 0 und d
082 _a517.521 SIG
100 _aSIGLER,L.E.
245 _aEXERCISE IN SET THEORY
260 _bNAROSA PUB. HOUSE
_c1979
300 _a134
942 _2ddc
_cB
999 _c42885
_d42885