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  1. Bird portraits,
    By: Seton, Ernest Thompson, - Hoffmann, Ralph,
    Publication info: Boston,Ginn & Company,1901.
    Holding Institution: Cornell University Library
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  2. Bird world : a bird book for children /
    By: Stickney, J. H. (Jenny H.), - Hoffmann, Ralph, - Seton, Ernest Thompson,
    Publication info: Boston :Ginn,c1898.
    Holding Institution: American Museum of Natural History Library
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  3. Correspondence relating to preliminary lists of New England plants, 1897-1904 (inclusive)
    By: Deane, Walter, - Ayres, Helen F., - Bishop, James N. (James Nathaniel), - Bissell, Charles Humphrey, 1857-1925, - Brainerd, Ezra, - Britton, Nathaniel Lord, - Chesley, Charles Henry, - Churchill, Joseph Richmond, - Clark, Hubert Lyman, - Collins, Frank S. (Frank Shipley), - Coulter, John Merle, - Eames, Edwin Hubert, - Eaton, A. A. (Alvah Augustus), - Eggleston, W. W. - Fernald, Merritt Lyndon, - Flynn, Nellie F., - Graves, Charles Burr, - Griffin, Delia Isabel, - Grout, A. J. - 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 1858-1929,
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: Archives from the Boston Metropolitan Park Flora | Harvard University Herbarium, Botany Libraries
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  4. Flora of Berkshire County, Massachusetts.
    By: Hoffmann, Ralph,
    Publication info: Boston,Printed for the Society,1922.
    Holding Institution: Cornell University Library
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  5. A guide to the birds of New England and eastern New York; containing a key for each season and short descriptions of over two hundred and fifty species, with particular reference to their appearance in the field.
    By: Hoffmann, Ralph, - Fuertes, Louis Agassiz,
    Publication info: Boston,Houghton, Mifflin and Company,1904.
    Holding Institution: Cornell University Library
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  6. A guide to the birds of New England and eastern New York; containing a key for each season and short descriptions of over 250 species, with particular reference to their appearance in the field,
    By: Hoffmann, Ralph,
    Publication info: BostonHoughton, Mifflin and company1904
    Holding Institution: American Museum of Natural History Library
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  7. A guide to the birds of New England and eastern New York; containing a key for each season and short descriptions of over two hundred and fifty species, with particular reference to their appearance in the field,
    By: Hoffmann, Ralph,
    Edition: [5th ed.]
    Publication info: Boston,Houghton, Mifflin and company[1904]
    Holding Institution: MBLWHOI Library
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