Reports of explorations and surveys for the location of a ship-canal between the Atlantic and Pacific oceans, through Nicaragua, 1872-'73 : under the direction of the Hon. George M. Robeson, Secretary of the Navy (1874)
United States. Navy Dept, Robeson, George M, Crosman, Alexander F, Hatfield, Chester, Lull, Edward Phelps, 1836-1887, Burndy Library, donor. DSI · Washington : Government Printing Office · leaf 45
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Canals
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
