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  1. The mathematical and other writings of Robert Leslie Ellis Edited by William Walton ; with a biographical memoir by Harvey Goodwin.
    By: Ellis, Robert Leslie, - Goodwin, Harvey, - Walton, William,
    Publication info: Cambridge [England] :Bell and Daldy,1863.
    Contributed by: University of California Libraries (archive.org)
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  2. Picturesque views on the river Niger : sketched during Lander's last visit in 1832-33 /
    By: Allen, William, - Haghe, Charles, - Picken, Thomas, - Walton, William, - Day & Haghe, - William Clowes and Sons,
    Publication info: London :J. Murray :1840.
    Contributed by: Smithsonian Libraries
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