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  1. By: Houghton, Fred F.
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 18
    Issue: 205
    Date: 1917-01
    Page Range: 15--18
    Publication Info: Lancaster, Pa, Published for the Garden by the New Era Printing Co, 1900-
  2. By: Houghton, Fred F.
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 18
    Issue: 206
    Date: 1917-02
    Page Range: 35--39
    Publication Info: Lancaster, Pa, Published for the Garden by the New Era Printing Co, 1900-
  3. By: Houghton, Fred F.
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 18
    Issue: 207
    Date: 1917-03
    Page Range: 61--65
    Publication Info: Lancaster, Pa, Published for the Garden by the New Era Printing Co, 1900-