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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Jackson, Raymond C. (Raymond Carl),
    Type: Article
    In: Rhodora
    Volume: 58
    Date: 1956
    Page Range: 97--100
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Jackson, Raymond C. (Raymond Carl),
    Type: Article
    In: Rhodora
    Volume: 64
    Date: 1962
    Page Range: 142--143
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Jackson, Raymond C. (Raymond Carl), - Johnson, R. Roy (Raymond Roy),
    Type: Article
    In: Rhodora
    Volume: 69
    Date: 1967
    Page Range: 476--480
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Jackson, Raymond C. (Raymond Carl),
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 15
    Date: 1959
    Page Range: 54--57
    Publication Info: Berkeley, California Botanical Society,