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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Rock, Howard F L
    Type: Article
    In: Rhodora
    Volume: 58
    Date: 1956
    Page Range: 311--317
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Rock, Howard F L
    Type: Article
    In: Rhodora
    Volume: 59
    Date: 1957
    Page Range: 128--158
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Rock, Howard F L
    Type: Article
    In: Rhodora
    Volume: 59
    Date: 1957
    Page Range: 168--178
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Rock, Howard F L
    Type: Article
    In: Rhodora
    Volume: 59
    Date: 1957
    Page Range: 203--216
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],