00309nam a2200097Ia 4500008004100000082003200041100003300073245005200106260004600158300000700204140113s9999    xx            000 0 und d  a664:351.77(100)(082.2)   K6  aNational Academy of Sciences  aProspects of the world food supply- A Symposium  a1966bNational Academy of SciencecU.S.A.  a84