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  1. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids, by George Harrison Shull.
    By: Shull, George Harrison,
    Publication info: Washington, D.C.,Carnegie Institution of Washington,1909.
    Holding Institution: NCSU Libraries (archive.org)
    Subjects: Bursa bursa-pastoris  Bursa heegeri  Plant hybridization  
    View Book
  2. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids, by George Harrison Shull.
    By: Shull, George Harrison,
    Publication info: Washington, D.C.,Carnegie Institution of Washington,1909.
    Holding Institution: University of California Libraries (archive.org)
    Subjects: Bursa bursa-pastoris  Bursa heegeri  Hybridization, Vegetable  
    View Book