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  1. By: Robertson, A - Roberts, B A
    Type: Article
    In: Rhodora
    Volume: 84
    Date: 1982
    Page Range: 101--115
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Robertson, A
    Type: Article
    In: Rhodora
    Volume: 82
    Date: 1980
    Page Range: 369--374
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Robertson, A
    Type: Article
    In: Records of the Indian Museum
    Volume: 22
    Date: 1921
    Page Range: 33--65
    Publication Info: Calcutta Pub. by order of the trustees of the Indian Museum 1907-1962