00309nam a2200097Ia 4500008004100000082001500041100003300056245006800089260004600157300000800203140113s9999    xx            000 0 und d  a577.1   L2  aNational Academy of Sciences  aSpecifications & criteria for biochemical compounds 3rd edition  a1972bNational Academy of SciencecU.S.A.  a216