Bell, Alexander Graham. Alexander Graham Bell Family Papers, Library of Congress, Washington, D.C.
Butler, Benjamin. Benjamin F. Butler Papers, Library of Congress, Washington, D.C.
Caton, John Dean. Papers of John Dean Caton, Library of Congress, Washington, D.C.
Chandler, William E. Papers of William E. Chandler, Library of Congress, Washington, D.C.
Clowry, Robert Charles. Papers of Robert Charles Clowry, Library of Congress, Washington, D.C.
Cornell, Ezra. Ezra Cornell Papers, Cornell University Library, Ithaca, N.Y.
Field, Cyrus W. Cyrus W. Field Papers, New York Public Library, Humanities Manuscripts and Archives, New York, N.Y.
George, Henry. Henry George Papers, New York Public Library, Humanities Manuscripts and Archives, New York, N.Y.
Green, Norvin. Green Family Papers, University of Kentucky Library, Lexington, Ky.
Green, Norvin. Norvin Green Papers, Filson Historical Society, Louisville, Ky.
Green, Norvin, Uncataloged Green Family Papers, Filson Historical Society, Louisville, Ky.
Gross, William L. William L. Gross Papers, Western Reserve Historical Society, Cleveland, Ohio.
Hubbard, Gardiner Greene. Hubbard Family Papers, Library of Congress, Washington, D.C.
Manning, William Andrew. William Andrew Manning Papers, Western Reserve Historical Society, Cleveland, Ohio.
Marble, Manton. Papers of Manton Marble, Library of Congress, Washington, D.C.
Morse, Samuel F. B. Papers of Samuel Finley Breeze Morse, Library of Congress, Washington, D.C.
O’Reilly, Henry. Henry O’Reilly Papers, New-York Historical Society, New York, N.Y.
O’Reilly, Henry. Henry O’Reilly Papers, Rochester Historical Society (held by Rochester Public Library), Rochester, N.Y.
Post, George Browne. George B. Post Architectural Record, New-York Historical Society, New York, N.Y.
Shepard, Helen Miller Gould. Helen Miller Gould Shepard Papers, New-York Historical Society, New York, N.Y.
Sherman, John. Papers of John Sherman, Library of Congress, Washington, D.C.
Sibley, Hiram. Hiram Sibley Family Papers, Rochester University, Rochester, N.Y.
Sibley, Hiram. Hiram Sibley Family Papers Addition, Rochester University, Rochester, N.Y.
Wade, Jeptha Homer. Jeptha Homer Wade Family Papers, Western Reserve Historical Society, Cleveland, Ohio.
Washburne, Elihu Benjamin. Papers of E. B. Washburne, Library of Congress, Washington, D.C.
Western Union Telegraph Company Records, Archive Center, National Museum of American History, Smithsonian Institution, Washington, D.C.