00305nam a2200097Ia 4500008004100000082002300041100002900064245006300093260004300156300000800199140113s9999    xx            000 0 und d  a631.52(082.2)   K7  a"Frey, Kenneth. J., Ed."  aPlant breeding:  A Symposium held at Iowo State University  a1967bIowa State Univ. PresscNew York  a430