00301nam a2200121Ia 4500082001700000100002300017245004100040260003500081300002000116490003300136500000500169700000500174  a516bW187.DT  aWallace, Andrew H.  aDifferential topology; first stepsb  aNew YorkbW. A. Benjaminc1968  axi, 130p. Index  aMathematics monograph series  a  a