00309nam a2200097Ia 4500008004100000040003800041100001900079245004400098250000600142260006300148211215s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aHawkins, R. R. 0aScientific, Medical and Technical Books  a2  bNational Academy of Sciences .aWashington, U. S. A.c1958