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  1. Bird portraits,
    By: Seton, Ernest Thompson, - Hoffmann, Ralph,
    Publication info: Boston,Ginn & Company,1901.
    Contributed by: Cornell University Library
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  2. Bird world : a bird book for children / by J.H. Stickney ; assisted by Ralph Hoffmann.
    By: Stickney, J. H. - Hoffmann, Ralph, - Seton, Ernest Thompson,
    Publication info: Boston :Ginn,c1898.
    Contributed by: 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. - Bissell, Charles Humphrey, 1857-1925, - Brainerd, Ezra, - Britton, Nathaniel Lord, - Chesley, Charles Henry, - Churchill, Joseph Richmond, - Clark, Hubert Lyman, - Collins, Frank S. - Coulter, John Merle, - Eames, Edwin Hubert, - Eaton, A. A. - Eggleston, W. W. - Fernald, Merritt Lyndon, - Flynn, Nellie F., - Graves, Charles Burr, - Griffin, Delia Isabel, - Grout, A. J. - Harger, Edgar Burton, - Hervey, E. W. - Hoffmann, Ralph, - Jesup, Henry G. - Jones, L. R. - Pringle, Cyrus G. - Purdie, Henry Augustus, - Robinson, Benjamin Lincoln, - Rose, J. N. - Sargent, Herbert E., - Stevens, Alice F., - Williams, Emile Francis 1858-1929,
    Contributed by: 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.
    Contributed by: 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.
    Contributed by: 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 Ralph Huffmann...with four full page plates by Louis Agassiz Fuertes and nearly 100 cuts in the text.
    By: Hoffmann, Ralph,
    Publication info: BostonHoughton, Mifflin and company1904
    Contributed by: 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 Ralph Huffmann...with four full page plates by Louis Agassiz Fuertes and nearly 100 cuts in the text.
    By: Hoffmann, Ralph,
    Edition: [5th ed.]
    Publication info: Boston,Houghton, Mifflin and company[1904]
    Contributed by: MBLWHOI Library
    BHL Collections: MBLWHOI Library, Woods Hole
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