Subseries A. Correspondence contains over 2,200 letters dating from 1826 to 1892, and was largely organized by Wheatland himself. Letters are organized chronologically by date received; most were received within a month of being sent. Most circulars and meeting announcements are organized separately in the Other Organizations subseries (Series II. Subseries F.), though a few remain in this section. Correspondents include family members, J.P. Dabney, Dr. J. Farnum Jr., Reverend Joseph B. Felt, W. Knights Jr., George A. Perkins, William Prescott, E.S.L. Richardson, and Edwin Willcox among many others.