This waste book contains accounts with various persons in Pennsylvania, Maryland, and New Jersey for dry-goods, notions, rum, cutlery, glassware, and medicines.

This notebook contains accounts with Farmers and Mechanics Bank, names of debtors and creditors, and "Feed Book," naming owners of animals and the amount of oats consumed by their beasts. Contains reference to R. Bache.

This account book contains receipts and expenditures for the Flying Camp (1783), and business accounts for purchases of bread and candles, and for expenses of traveling and lodging (1785-1800).

The first three volumes contain journals of Strahan's travels in Scotland, with records of expenses along the way, for 1751, 1759, 1760, 1766, 1768, 1773, and 1777. Strahan and Benjamin Franklin were in Edinburgh at the same time in 1759. The fourth volume contains "The particulars of the estate of Wm Strahan as it stood on the first of January 1755," and also for 1759 and 1761, with some miscellaneous accounts.

A pioneer in ethnographic and linguistic studies of the American Indian and one of the most active members of the American Philosophical Society, Peter Stephen Du Ponceau helped to establish the American Philosophical Society's reputation as one of the world's foremost centers for the study of American Indians and their languages. The Peter Stephen Du Ponceau collection consists of correspondence on legal matters, Indian linguistics, silk culture, maritime law, the American Philosophical Society, and various publications of the early nineteenth century. The collection also includes several essays by Du Ponceau, most of which deal with maritime law.

One of the oldest houses in Philadelphia, Wyck is now a non-profit museum listed on the National Register of Historic Places. Nine generations of the Jansen-Wistar-Haines family owned the Wyck property from 1690 until 1973. The last family owner deeded 2.5 acres of land, the house and its contents, several outbuildings, a landscaped garden, and a small endowment to the Wyck Charitable Trust. The Wyck Charitable Trust and the Wyck Association now administer the preservation of the property and its educational services to the public. This collection contains diaries, letters, accounts, bills and receipts, deeds, and photographs. The collection as a whole is deepest for the period 1770-1970. Items of particular note include accounts of household expenses at Wyck from ca. 1790-1970; papers pertaining to the Academy of Natural Sciences of Philadelphia, Quaker schools, and social reform groups; agricultural and horticultural practices; and correspondence to and from cultural leaders of 18th and 19th century Philadelphia. The papers of the John S. Haines family (Ms. Coll. 52A) form part of the Wyck Papers. The papers cover the years 1845 to 1949 and are arranged into eight series.