00290nam a2200109Ia 4500008004100000082002100041100002400062245001900086260004600105300001000151650001900161140113s9999    xx            000 0 und d  a631.52(082.2) L7  a" Frey, Kenneth J."  aplant breeding  b"USA : Iowa state university press, 1977"  a430p.  aPlant breeding