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  1. By: Engler, Adolf, - Krause, Kurt, - Pilger, Robert Knuds Friedrich, - Prantl, Karl,
    Publication info: Leipzig,W. Engelmann,1887-1909.
    Holding Institution: Multiple institutions
  1. By: Pittier, Henri, - Gleason, H A - Pilger, Robert Knuds Friedrich, - Sprague, Thomas Archibald
    Type: List
    In: Plant lists : Colombia, Costa Rica, and Venezuela,
    Date: 1921-1922
  2. By: Killip, Ellsworth P. (Ellsworth Paine), - Smith, Albert Charles - Hitchcock, A. S. (Albert Spear), - Chase, Agnes, - Blake, S. F. (Sidney Fay), - Pilger, Robert Knuds Friedrich, - Schulz, Otto Eugen, - Perkins, Janet R. (Janet Russell),
    Type: List
    In: Plant lists : Colombia, Chile, Peru, and Brazil,
    Date: 1926-1927