Plant Breeding II / edited by Kenneth J. Frey. Plant Breeding Symposium (2nd : 1979 : Iowa State University) Frey, Kenneth J. ed. Plant breeding Congresses. SB123 .P56 1979 631.522 FRP Includes bibliographies and index. Ames : Iowa State University Press, 1981. 1981. 1981 Text x, 497 p. : eng