00278nam a2200097Ia 4500008004100000082002100041100003300062245003100095260004600126300000800172140113s9999    xx            000 0 und d  a574.6:529.7   L1  aNational Academy of Sciences  aSymposium on Biochenometry  a1971bNational Academy of SciencecU.S.A.  a662