00269nam a2200097Ia 4500008004100000082001700041100003600058245003100094260003800125300000800163140113s9999    xx            000 0 und d  a632.954   J1  a"Ahlgren,G.H. & Klingman, G.C."  aPrinciples of Weed control  a1951bJohn Wiley & SonscNew York  a368