00303nam a2200121Ia 4500008004100000082001400041100001300055245003300068260003400101300001500135600001200150650001900162140224s9999    xx            000 0 und d  a631.52 M0  aMayo, O.  aThe theory of plant breeding  aOxfordbClarendon Pressc1980  axiii,293p.  aO. Mayo  aPlant breeding