Series I, Correspondence with Friends & Associates, (1851-1919) includes letters to and from the Washburns in letterbook and loose form. The Washburns received letters from friends and missionaries in the U.S., the American Board of Commissioners for Foreign Missions, and numerous missionaries in India. Colleagues working on the sub-continent write of events and their work in such places as Pasumalai (home to the A.M. High School & Training Institution, the A.M. Lenox Press, etc.), Madura (where the American College was located), Dindigul, Kodikanal, Battalagundu, and Madras.
Series II. Correspondence with Family Members (1853-1916) contains letters sent and received by the Washburns with their sons, parents, siblings and other family members. Letters from the Washburns deal primarily with their missionary activities and their lives in India, although George's early letters from Williams College and the Andover Theological Seminary are also included here. The "friends at home" address was used on letters which were to be circulated among family members in America. Letters received from family members discuss family news and events in America, including the Civil War, slavery, and the assassination of President Lincoln.
Series III. Miscellaneous Mission & Family Papers (1851-1916) is divided into two subseries. Mission materials include diaries of the Washburns, one of George's sermons and statements on the Rockefeller gift protest, descriptions of Pasumalai and the Madura schools, as well as printed evangelistic bulletins, newspaper clippings and conference programs. Family papers consist of correspondence among family members, financial materials (including Miles Washburn's estate papers), Edwin Washburn's school lessons, miscellaneous poetry, photographs of George Washburn and other family members, etc.