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  1. By: Ringueberg, E N S (Eugene Nicholas Sylvester)
    Type: Article
    In: Bulletin of the American Iris Society
    Issue: 31
    Date: 1929-04
    Page Range: 32--35
    Publication Info: DeLeon Springs, Fla American Iris Society
  2. By: Ringueberg, E N S (Eugene Nicholas Sylvester) - Sturtevant, Robert S.
    Type: Article
    In: Bulletin of the American Iris Society
    Issue: 36
    Date: 1930-07
    Page Range: 47--50
    Publication Info: DeLeon Springs, Fla American Iris Society
  3. By: Yeld, George - Blauvelt Mr. - Ringueberg, E N S (Eugene Nicholas Sylvester) - Senni, Countess Giulio - Sturtevant, Robert S.
    Type: Article
    In: Bulletin of the American Iris Society
    Issue: 26
    Date: 1928-01
    Page Range: 54--65
    Publication Info: DeLeon Springs, Fla American Iris Society