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  1. By: Littlefield, E W
    Type: Article
    In: Rhodora
    Volume: 30
    Date: 1928
    Page Range: 129--131
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Littlefield, E W
    Type: Article
    In: Rhodora
    Volume: 33
    Date: 1931
    Page Range: 162--163
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  3. By: Pratt, W F - Litchfield, E W - Littlefield, E W
    Type: Article
    In: Rhodora
    Volume: 40
    Date: 1938
    Page Range: 241--242
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  4. By: Littlefield, E W
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 44
    Issue: 524
    Date: 1943-08
    Page Range: 185--191
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-