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  1. By: Gillis, William Thomas, - Howard, Richard A. (Richard Alden), - Proctor, G R
    Type: Article
    In: Rhodora
    Volume: 75
    Date: 1973
    Page Range: 411--425
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Gillis, William Thomas, - Proctor, G R
    Type: Article
    In: Phytologia
    Volume: 32
    Date: 1975
    Page Range: 201--213
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  3. By: Proctor, G R
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 63
    Issue: 3
    Date: 1982
    Page Range: 199--315
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  4. By: Proctor, G R
    Type: Article
    In: Phytologia
    Volume: 35
    Date: 1977
    Page Range: 403--403
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  5. By: Webster, Grady L. (Grady Linder),‏ ‎ - Proctor, G R
    Type: Article
    In: Rhodora
    Volume: 86
    Date: 1984
    Page Range: 121--125
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  6. By: Proctor, G R
    Type: Article
    In: Rhodora
    Volume: 68
    Date: 1966
    Page Range: 464--469
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  7. By: Proctor, G R
    Type: Article
    In: Rhodora
    Volume: 63
    Date: 1961
    Page Range: 31--35
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  8. By: Howard, Richard A. (Richard Alden), - Proctor, G R
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 38
    Issue: 2
    Date: 1957
    Page Range: 151--169
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-