00336nam a2200121Ia 4500082001800000100001900018245005400037260005200091300000900143490005200152500000500204700000500209  a514bSn669.CT  aSnapper, Ernst  aCohomology theory and algebraic correspondencesb  aProvidencebAmerican Mathematical Societyc1959  a96p.  aAmerican Mathematical Society memoirs v no. 33  a  a