00424    a2200145   4500020001500000082001700015100001700032245003300049250001200082260005000094300002100144650002300165650003100188650005900219  a0198541716  a631.523bMAY  aMayo, Oliver  aThe theory of plant breeding  a2nd ed.  aNew YorkbOxford University pressc1987g1987  axiii,334p.c23cm  aPlant introduction  aCultivation and harvesting  aproduction of propagational organism and new varieties