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  1. By: University of Illinois at Urbana-Champaign. Dept. of Agronomy.
    Publication info: Urbana, Ill, Dept. of Agronomy, University of Illinois at Urbana-Champaign, -1986
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: University of Illinois at Urbana-Champaign. Dept. of Agronomy.
    Publication info: Urbana, Ill, Dept. of Agronomy, University of Illinois at Urbana-Champaign, 1987-1997
    Holding Institution: University Library, University of Illinois Urbana Champaign