John Krider (1813-1886) was one of Philadelphia's most prominent gunsmiths during the nineteenth century. This collection consists of two bank books and a ledger.

Masters & Markoe was a mercantile house which operated throughout the early nineteenth century. Most of the records date from the period 1810 to 1814 and document the West Indian trade of Markoe & Masters. The collection consists of the business correspondence and accounts records which shows that the firm was primarily involved with the importation of sugar from Santa Cruz (St. Croix). The company also imported molasses, rum, coffee, mahogany, and logwood. There are also personal papers of the firms co-founder, Thomas Masters (1781-1844) and members of his family.

Mordecai Lewis & Company (Philadelphia) was a merchant firm that owned several ships and specialized in imports of European goods, including white lead and, eventually, paint. The account sheet documents the sales of powder to William Bingham (1752-1804).

Pierre A. Gentieu (1842-1930) was a photographer and a long-term employee of E.I. du Pont de Nemours & Company, a chemical company more commonly referred to as the DuPont company. Gentieu's papers include correspondence with du Pont family members and coworkers, an account book of powder packed at the Hagley Yard (1858-1902), a record book with lists of explosions (1882-1909), time work sheets of powdermen during the 1890s, and a list of the principal events in the powder yards from 1882 to 1911.

The William Shinn & Co. installed stamped sheetmetal ceilings, cornices, skylights, roofing, and ductwork and employed about a dozen workers and apprentices. It was founded in 1907 in Wilmington, Delaware by William Shinn (1883-1947), a tinsmith and cornice worker, and his brother John A. Shinn (1886-1955). The records are a very small sample of accounting items documenting the operation of a handicraft contracting business.