00272nam a2200097Ia 4500008004100000082002500041100003300066245002200099260004600121300000700167140113s9999    xx            000 0 und d  a06.045:5/6(047)   L2  aNational Academy of Sciences  aSceince Committee  a1972bNational Academy of SciencecU.S.A.  a24