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  1. By: Freckmann, Robert W
    Type: Article
    In: Phytologia
    Volume: 39
    Date: 1978
    Page Range: 268--272
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  2. By: Freckmann, Robert W - Lelong, Michel G
    Type: Article
    In: SIDA, contributions to botany
    Volume: 20
    Date: 2002
    Page Range: 161--174
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  3. By: Freckmann, Robert W
    Type: Article
    In: Phytologia
    Volume: 48
    Date: 1981
    Page Range: 99--110
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke