00460nam a2200133Ia 4500008004100000082002400041100001700065245008300082260002300165300000700188942000700195952010700202999001700309140113s9999    xx            000 0 und d  a631.527.52:635   H6  a"Ashton, T."  aThe Use of heterosis in the production of agricultural and horticultural crops  a1949bCABcFarnham  a30  cBK  00104070aVTLbVTLd2014-01-13l0o631.527.52:635   H6pVBK2753r2014-01-13 00:00:00w2014-01-13yBK  c59434d59434