00309nam a2200121Ia 4500008004100000082001400041100001700055245003300072260003300105300001400138600001600152650001900168140224s9999    xx            000 0 und d  a631.52 K0  aAllard, R.W.  aPrinciples of plant breeding  aNew YorkbJohn Wileycc 1960  avii,485p.  aR.W. Allard  aPlant breeding