00281nam a2200097Ia 4500008004100000082001600041100002800057245005300085260003700138300000800175140113s9999    xx            000 0 und d  a631.52   J1  a"Lawrence, George.H.M."  a"Practical plant breeding revised , 3rd edition"  a1951bAllan & Unwin Ltd.cLondon  a164