00333nam a2200121Ia 4500082001700000100001800017245004000035260005200075300002100127490005300148500000500201700000500206  a514bM466.CS  aMay, J. Peter  aClassifying spaces and fibrationsb  aProvidencebAmerican Mathematical Societyc1975  axiii, 98p. Bibl.  aAmerican Mathematical Society memoirs v no. 155  a  a