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  1. The clays and clay industry of New Jersey /
    By: Ries, Heinrich, - Knapp, George N. - Kümmel, Henry Barnard,
    Publication info: Trenton, N.J.,MacCrellish & Quigley, printers,1904.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  2. The quaternary formations of southern New Jersey /
    By: Salisbury, Rollin D., - Knapp, George N.
    Publication info: [S.l. :s.n.],1917
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  3. A report on the Cretaceous paleontology of New Jersey; based upon the stratigraphic studies of George N. Knapp.
    By: Weller, Stuart, - Knapp, George N.
    Publication info: Trenton, N.J. :MacCrellish & Quigley, state printers,1907.
    Contributed by: University of California Libraries (archive.org)
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