The Daniel Morgan collection is made up of 63 financial records, legal documents, correspondence, and other items related to General Daniel Morgan and to Willoughby Morgan, his son. The majority of the collection consists of accounts, bonds, promissory notes, and other documents pertaining to Daniel Morgan's financial affairs. Accounts and invoices record Morgan's purchases of clothing, wagon-related equipment and services, and other items. Some of the later items do not concern Morgan directly but have his legal endorsement. Also included are two outgoing letters by Morgan, a 9-page legal document about a lawsuit against Morgan, and a deposition that Morgan gave in a different dispute. Other items are a bond regarding Morgan's marriage to Abigail Curry (March 30, 1773) and Morgan's political address to the citizens of Allegheny County about politics and the militia (January 17, 1795). Three of the documents pertain to enslaved and free African Americans (November 6, 1773; June 13, 1789; and March 28, 1799). Later items mostly pertain to the estate of Willoughby Morgan, Daniel Morgan's son. James Graham wrote two letters to unknown recipients in 1847 and 1856 about his efforts to write Daniel Morgan's biography, which he subsequently published.
Printed items include a map of the surrender of Yorktown (undated), a newspaper article from a Winchester, Virginia, paper about the possible disinterment of Daniel Morgan's remains (August 18, 1951), and printed portraits of Daniel Morgan with manuscript and facsimile autographs.