Manuscripts and letters pertaining to Edward Wortley Montagu, husband of Lady Mary Wortley Montagu. The letters to Montagu, dating from 1723 to 1760, include correspondence with his father-in-law, Evelyn Pierrepont, John Montagu, the Earl of Sandwich, Chief Justice Peter King, and Lady Elizabeth Hamilton. There is also correspondence concerning Parliamentary elections, a bill in Parliament (1718), his son's reputation, and property matters. The manuscripts cover a range of personal matters, among the "Expenses at Bath" a record of his weight, estimates of his personal estate and debts, an expense account for his tour as ambassador to Turkey, a prescription for the treatment of gout, and the use of wine for health purposes.

The Pierrepont family papers (1761-1918) document the intersection of commercial, civic and personal interests across three generations of one of the most prominent and influential families of nineteenth century Brooklyn, New York. The bulk of the collection concerns the business dealings of Henry Evelyn Pierrepont from 1838 to his death in 1888. This especially includes an extensive set of accounting and transactional records concerning the Pierrepont Stores, the family's warehouse on Brooklyn's East River waterfront; these include records of ships arriving at the Stores and their cargoes delivered. Additionally, there are substantive correspondence, legal documents and other materials concerning the Union Ferry Company, of which Henry was an officer. In addition to commerce and shipping, a major theme of the collection is that of land acquisition in Brooklyn Heights and at the adjacent waterfront in the early nineteenth century, and the development of that property over the course of the century. Included in the collection are correspondence, deeds, indentures, leases, accounting records, diaries, maps, invoices, receipts, business proposals, legal filings, clippings, and historical and genealogical manuscripts.