00305nam a2200109Ia 4500008004100000040001100041100002200052245005200074260004700126300001300173300000900186251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aSaunders Mac Lane 0aProceedings Of The National Academy Of Sciences  c1966bThe National Academy Of ScienceaUSA  aP.1-1058  bV.56