New York State Governor, 1885-1891; U.S. Senator, 1891-1897. Collection contains incoming and outgoing correspondence (chiefly political), legal papers and memorabilia.

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 Utica attorney, U.S. Senator. Outgoing correspondence primarily of a political nature, which reflects Conkling's interest in Republican Party politics at the State and national levels. Includes letters to Thomas Alvord, Henry J. Cookinham, James M. Dalzell, and Edward Ingersoll.