Hubbard, S. D. (2), June 27, 1833 and undated

The Willbur Fisk papers consist of two large series. The first, Correspondence, is arranged into two groups: letters to Willbur Fisk, and letters from Willbur Fisk. Both groups are arranged alphabetically. There are links in the finding aid to complete inventories of the letters. The letters from Willbur Fisk have both alphabetical and chronological inventories, although the letters are physically arranged in alphabetical order.

The second series, Papers, are items written or collected by Willbur Fisk and his wife Ruth Peck Fisk. These include number of papers related to Wesleyan University and its founding, such as correspondence and other materials about faculty and students, scientific equipment for the univeristy, and financial issues. Many of Fisk's own writings can also be found in this series, on topics ranging from abolitionism to Methodist issues. A number of Fisk's early schoolwork, featuring reports and poems, is listed under Compositions. Addresses and sermons written and delivered by Fisk can also be found in the Papers series.

A subset of the papers are items written by or belonging to Ruth Peck Fisk. These primarily consist of writings about her husband, and letters to Mrs. Fisk after her husband's death. There are also a few printed items belonging to Mrs. Fisk in this series.