00521nam a2200181Ia 4500082001700000100002900017245004900046260003400095300001500129490003900144500000500183690000600188700000500194952009900199964001700298921000900315999001500324  a512bB268.EC  aBarr, Michael and Others  aExact categories and categories of sheavesb  aBerlinbSpringer-Verlagc1971  avii, 239p.  aLecture notes in Mathematicsv 236  a  a   a  00104070aISIbISId1998-09-04l0o512 B268.ECpDP14298r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a8546  c8546d8546