00346nam a2200109Ia 4500008004100000040001100041100002200052245008400074260005500158300001300213300001000226251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aSaunders Mac Lane 0aProceedings of the National Academy Of Sciences of the United States of America  cMay, 1968bThe National Academy of SciencesaU.S.A  aP. 1-742  bV. 60