00393nam a2200133Ia 4500008004100000082001700041100001900058245003800077260004200115300000800157650004100165650003400206653001900240170901s1929    xx            000 0 und d  a631.53bR58P  aRoberts, H. F. 0aPlant Hybridization Before Mendel  aUSAbPrinceton University Pressc1929  a372  aAgriculture and related technologies  aTechnology (Applied sciences)  aPlant breeding