Papers of the Congressman from New York, United States minister to France, Vice-President of the United States, and Republican governor of New York State. Collection contains mostly incoming correspondence from clergymen, educators, financiers, journalists, and politicians. Some letters are addressed to Morton's executive secretary, Ashley W. Cole.

Papers of the Lawyer, New York State governor, presidential candidate, U.S. Secretary of State. Outgoing correspondence, with the exception of two incoming letters from Horatio C. King and George B. McClellan. Most of the letters are responses to recommendations for various appointments and speaking invitations. Letters to John Barrett, Princess Bibesco, Joseph Buffington, Samuel P. Cadman, Samuel M. Cavert, Edward Fallows, Bert M. Fernald, Roy G. Fitzgerald, Julius Frank, Robert H. Fuller, Martin H. Glynn, Paul Hickok, Hamilton Holt, R. U. Johnson, Winfield Jones, William A. Nash, Clarence Owens, Robert Paine, Amasa J. Parker, George Pratt, Palmer Ricketts, E. Quincy Smith, Robert E. Speer, Frederic J. Stimson, Charles Vrooman, Albert H. Walker, Henry Wallace, George W. Wickersham, and Sidney Woodward.

Incoming and some outgoing correspondence of the New York State Congressman and Governor, mainly from his term in the House of Representatives.