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Changes in Pedigree Backgrounds of Pioneer Brand Maize Hybrids Widely Grown from 1930 to 1999

^a Pioneer Hi-Bred International, Inc., Crop Genetics Research and Product Development, DuPont Agriculture and Nutrition, 7300 N.W. 62nd Ave., P.O. Box 1004, Johnston, IA 50131-1004
^b 6837 N.W. Beaver Drive, P.O. Box 446, Johnston, IA 50131-0446

View larger version (36K): [in a new window]   Fig. 1. Association of era hybrids following multivariate analysis of pedigree distance (1-CP) data. Hybrids are denoted according to their decade of initial release. Groupings are referred to in the text.