00441nam a2200145Ia 4500008004100000082001700041100001900058245010000077260004200177300000800219650001800227650001800245653001400263653001800277170901s1964    xx            000 0 und d  a575.28bG61H  aGowen, John W. 0aHeterosisbA Record of Researches Directed Toward Explaining and Utilizing the Vigor of Hybrids  aNew YorkbHafner Publishing Co.c1964  a552  aLife sciences  aPure Sciences  aHeterosis  aHybridization