00342nam a2200109Ia 4500008004100000040001100041100002200052245008400074260005000158300001400208300001000222251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aSaunders Mac Lane 0aProceedings of the National Academy Of Sciences of the United States of America  c1961bThe National Academy of SciencesaU.S.A  aP. 1-2040  bV. 47