000 00420nam a2200169Ia 4500
008 180424s9999 xx 000 0 und d
084 _a512.2 H1
100 _a"Higgins, Philip J"
245 0 _aNotes on Categories and Groupoids
250 _a\\197100ENGGPSX
260 _aVan Nostrand Reinhold
260 _b1971
260 _cLondon
300 _a178p
500 _aincludes index and biblioraphy
942 _cBK
999 _c30015
_d30015