Containing over 4 linear feet of letters and documents, the Franklin-Bache Papers comprises the second largest collection of letters and documents relating to Benjamin Franklin in the APS Library. Although the scope of the collection is broad, including materials from the time of Franklin's arrival in Philadelphia to his death, the heart of the collection documents the period of Franklin's ministry in France (1776-1785) and his diplomatic efforts to win financial and military support for the revolutionary cause, as well as less intensive coverage of his ministry in England before the Revolution. Franklin's correspondence with American and French officials, financiers (personal and otherwise), and savants provides tantalizing details on the social context of Franklin's ministry in France, his intellectual life, and his growing celebrity. Much of the correspondence documents the efforts to convince French officials early in the war to support the American cause, but there is valuable material relating to the peace negotiations as well. The collection is equally rich in personal correspondence, including a rich set of letters from Mary Stevenson Hewson, Georgiana Shipley, Catherine Ray Greene, Jane Mecom, Deborah Franklin, and a number of Franklin's other relatives. The collection is arranged chronologically.

Since publication of I. Minis Hays's Calendar of the Papers of Benjamin Franklin in 1908, the APS Library has acquired a large number of miscellaneous letters and other documents relating to the life, mind, and work of Franklin and his immediate family. The collections listed in this finding aid consist of letters and documents to and from Franklin organized into groupings based upon provenance or focal point. The largest grouping consists of miscellaneous materials acquired individually or in small groups over the years, including a number of important individual items. The other collections consist largely of correspondence between Franklin and individual friends and colleagues, including his friends Mme Brillon, Mary "Polly" Stevenson Hewson, and Catherine Ray Greene, the Whig agriculturist Richard Jackson, and the printer Francis Childs. The collections include photostats of selected materials held by other institutions or that were in private hands. These are available for reference only.

The Calendar of the Papers of Benjamin Franklin prepared by Isaac Minis Hays for the bicentennial of Franklin's birth in 1906 provides access to the largest portion of the Franklin Papers at the APS. The items were originally bound into volumes in roughly chronological order, with letters to Franklin preceding those from Franklin and at the end of the collection, Franklin's letters owned by the University of Pennsylvania. Each manuscript is still identified by Hays' reference numbers, which include a roman numeral refering to the original volume followed by an arabic number to identify the folio. The electronic version of the finding aid replicates Hays' calendar, including the introductory material and item-level descriptions. It has been updated to reflect corrections in the metadata, corrections of personal names, dates, and description.