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  1. By: Seton, Ernest Thompson, - Hoffmann, Ralph,
    Publication info: Boston, Ginn & Company, 1901
    Holding Institution: Multiple institutions
  2. By: Stickney, J. H. (Jenny H.), - Hoffmann, Ralph,
    Publication info: Boston, U.S.A, Ginn, 1900
    Holding Institution: University of Toronto - Thomas Fisher Rare Book Library
  3. By: Stickney, J. H. (Jenny H.), - Hoffmann, Ralph, - Seton, Ernest Thompson,
    Publication info: Boston, Ginn, c1898
    Holding Institution: American Museum of Natural History Library
  4. By: Hoffmann, Ralph,
    Publication info: Boston, 1900
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  5. By: Deane, Walter, - Ayres, Helen F., - Bishop, James N. (James Nathaniel), - Bissell, Charles Humphrey, - Brainerd, Ezra, - Britton, Nathaniel Lord, - Chesley, Charles Henry, - Churchill, Joseph Richmond, - Clark, Hubert Lyman, - Clark, Hubert Lyman, - Collins, Frank S. (Frank Shipley), - Coulter, John Merle, - Eames, Edwin Hubert, - Eaton, A. A. (Alvah Augustus), - Eggleston, W. W. (Willard Webster), - Fernald, Merritt Lyndon, - Flynn, Nellie F., - Graves, Charles Burr, - Griffin, Delia Isabel, - Grout, A. J. (Abel Joel), - Grout, A. J. (Abel Joel), - Harger, Edgar Burton, - Hervey, E. W. (Eliphalet Williams), - Hoffmann, Ralph, - Jesup, Henry G. (Henry Griswold), - Jones, L. R. (Lewis Ralph), - Pringle, Cyrus G. (Cyrus Guernsey), - Purdie, Henry Augustus, - Robinson, Benjamin Lincoln, - Rose, J. N. (Joseph Nelson), - Sargent, Herbert E., - Stevens, Alice F., - Williams, Emile Francis,
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: Archives from the Boston Metropolitan Park Flora
  6. By: Hoffmann, Ralph,
    Publication info: Boston, 1922
    Holding Institution: Multiple institutions
  7. By: Hoffmann, Ralph, - Fuertes, Louis Agassiz,
    Publication info: Boston Houghton, Mifflin and Company 1904
    Holding Institution: Multiple institutions
  8. By: Hoffmann, Ralph,
    Publication info: Stockbridge, 1914
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  9. By: Hoffmann, Ralph,
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  10. By: Hoffmann, Ralph, - Knobel, Edward, - Massachusetts Audubon Society.
    Publication info: Boston, Published by Massachusetts Audubon Society, 1899
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  11. By: Hoffmann, Ralph, - Brewster, William,
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    BHL Collections: William Brewster Papers
  1. By: Hoffmann, Ralph,
    Type: Article
    In: Rhodora
    Volume: 19
    Date: 1917
    Page Range: 37--37
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Hoffmann, Ralph,
    Type: Article
    In: Rhodora
    Volume: 19
    Date: 1917
    Page Range: 60--60
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Hoffmann, Ralph,
    Type: Correspondence
    In: Correspondence relating to preliminary lists of New England plants, 1897-1904 (inclusive)
    Date: 1904-04-01
  4. By: Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 21
    Date: 1904
    Page Range: 393--394
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  5. By: Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 16
    Date: 1899
    Page Range: 196--196
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  6. By: Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 36
    Date: 1919
    Page Range: 106--107
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  7. By: Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 20
    Date: 1903
    Page Range: 211--212
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  8. By: Hoffmann, Ralph,
    Type: Article
    In: Rhodora
    Volume: 6
    Date: 1904
    Page Range: 202--206
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  9. By: Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 12
    Date: 1895
    Page Range: 188--189
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  10. By: Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 33
    Date: 1916
    Page Range: 196--196
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  11. By: Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 37
    Date: 1920
    Page Range: 453--454
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  12. By: Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 13
    Date: 1896
    Page Range: 297--312
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  13. By: Hoffmann, Ralph,
    Type: Article
    In: Rhodora
    Volume: 1
    Date: 1899
    Page Range: 229--230
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  14. By: Brewster, William, - Hoffmann, Ralph,
    Type: Article
    In: The Auk
    Volume: 19
    Date: 1902
    Page Range: 420--420
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  15. By: Hoffmann, Ralph,
    Type: Article
    In: Rhodora
    Volume: 4
    Date: 1902
    Page Range: 188--188
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],