00392nam a2200109Ia 4500008004100000082001700041100002400058245010000082260004300182300001400225650004300239140224s9999    xx            000 0 und d  a631.527.5 J2  aGowen, John W., ed.  aHeterosis, a record of researches directed toward explaining and utilising the vigor of hybrids  aAmesbIowa State college presscc 1952  avii,552p.  aHeterosis,Plant breeding,Hybrid vigour