The papers of James Ross, U.S. senator and great-great-grandfather of John Ross Delafield, consist of correspondence, documents, estate papers, genealogical papers, miscellaneous material, visual material, printed matter, and papers of others. The correspondence contains legal and business letters, including letters by George Washington and Alexander Hamilton. Found among the documents and estate papers are deeds, insurance policies, wills, estate vouchers, and a survey book of the Ross proerty, as well as correspondence among Hopewell Hepburn, Hugh Brady Wilkins, and William Addison, the executors of the estate. The genealogical papers contain letters to Maturin L. Delafield and his sons, Joseph L. Delafield and John Ross Delafield, memoirs of James Ross by James Brownson and James Veech, biographical notes, and genealogies. There is miscellaneous material concerning the development of Tarantum, Pa., and Steubenville, Ohio, as well as some financial papers such as canceled checks, receipts, and account books (1801-1844). The visual material contains a photograph of a Thomas Sully portrait of Ross and architectural drawings of his summer home. The papers of others are those of James Ross, Jr., and include correspondence, documents, and miscellaneous financial papers.