00315nam a2200097Ia 4500008004100000040001100041100002100052245008400073260005000157300001000207251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aSauders Mac Lane 0aProceedings of the National Academy Of Sciences of the United States of America  c1960bThe National Academy of SciencesaU.S.A  bV.313