00343nam a2200121Ia 4500082001700000100003600017245003800053260003400091300002000125490004100145500000500186700003000191  a512bH656.CH  aHilton, P. J. and Stammbach, U.  aA course in homological algebrab  aBerlinbSpringer-Verlagc1971  aix, 338p. Index  aGraduate texts in Mathematicsv v. 4  a  aStammbach, U. ; jt. auth.