00263nam a2200097Ia 4500008004100000082001600041100003300057245003000090260003700120300000800157140113s9999    xx            000 0 und d  a631.52   J5  a"Hayes, H.K. and Immer, F.R"  aMethods of plant breeding  a1955bMcGraw Hill BookcNew York  a551