00311nam a2200097Ia 4500008004100000082001700041100003300058245006800091260004600159300000800205140113s9999    xx            000 0 und d  a632.954   K1  aNational Academy of Sciences  aWeed  control (Principles of Plant & animal-Pest control vol.2)  a1961bNational Academy of SciencecU.S.A.  a471