00249nam a2200097Ia 4500008004100000040001100041245001200052260006400064300001300128300001000141251112s9999||||xx |||||||||||||| ||und||  aCNCLSA 0aScience  cJuly 10, 1960bThe National Academy of SciencesaWashington  aP. 1-414  bV. 54