00357nam a2200133Ia 4500020001500000082001700015100002000032245003800052260005200090300002700142490004400169500000500213700000500218  a0281832700  a514bH294.SC  aHarper, John R.  aSecondary cohomology operationsb  aProvidencebAmerican Mathematical Societyc2002  axi, 268p. Bibl. Index.  aGraduate Studies in Mathematicsv v. 49  a  a