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  1. By: Hopkins, M
    Type: Article
    In: Rhodora
    Volume: 44
    Date: 1942
    Page Range: 193--211
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Hopkins, M - Waterfall, U. T. (Umaldy Theodore),
    Type: Article
    In: Rhodora
    Volume: 45
    Date: 1943
    Page Range: 113--7
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]