00267nam a2200097Ia 4500008004100000082002600041100002300067245003100090260003100121650001700152220204s9999    xx            000 0 und d  a632.51:631.348.4bAHL  aAHLGREN, Gilbert H 0aPrinciples of weed control  aNew YorkbJohn Wileyc1951  aWeed control