Amelia Elizabeth du Pont (1796-1869) was a granddaughter of Pierre Samuel du Pont de Nemours (1739-1817), founder of the E.I. du Pont de Nemours & Company, a chemical research and manufacturing company. She was the eldest child of Victor Marie du Pont (1767-1827) and Gabrielle Josephine de la Fite de Pelleport (1770-1837). The collection is a microfilm of selected papers pertaining to the Pennsylvania property owned by du Pont.

Anthony Morris (1766-1860) was a lawyer and merchant of Philadelphia. Morris was active in the East India trade. Morris's letters are largely concerned with business affairs, administration and sale of lands, and state politics. The letters date from 1800 to 1808.

Bellevue estate, now the Bellevue State Park, is a historic estate that was once a series of farms owned by members of the Orr, Grubb, and Stevenson families and later purchased by William du Pont (1855-1928). The records are a series of deeds covering the conveyance of the Bellevue property from 1782 to 1920. There are also three maps of the estate, including one showing the location of the house and landscaping.

Charles Findeisen (1919-2007) was an aerial photographer hobbyist turned professional and spent most of his life flying airplanes. Findeisen consulted for real estate development concerns, engineering firms, and construction companies among others. Virtually all of his work was in the tri-state region of New Jersey, Pennsylvania, and Delaware.

This collection contains his aerial photography from 1962 to 2000. It is comprised mostly of negatives but does include some photographs. Many of his subjects were photographed over time at regular intervals. This is particularly true of real estate development programs and building projects. But there is also one-off material of current events, local places, and landmarks.

Daniel Cauffiel (1867-1930) was a merchant, real estate developer, and entrepreneur of Johnstown, Pennsylvania and Wilmington, Delaware. The Daniel Cauffiel papers depict his career as a small business entrepreneur and as an agent or employee of the du Pont family and in their various businesses.

Oliver Canby (1716-1754) was a miller on the Brandywine Creek. This collection of deeds and indentures documents the acquisition of mills or mill seats, and other lands near the Brandywine Creek in Wilmington, Delaware by the Canby family. This collection was in the possession and care of the Canby family until it was given to Hagley Museum and Library in 2011 by a descendant of Oliver Canby.

Pierre Samuel du Pont de Nemours (1739-1817) was a French political economist, writer, publisher, and public administrator. Françoise Robin du Pont (1748-1841) was the second wife of du Pont de Nemours. The collection contains photocopies of documents signed relating to both du Pont de Nemours, their prosperity, loans, and power of attorney.

E.I. du Pont de Nemours & Company is a chemical company more commonly referred to as the DuPont company. The company was established in 1802 by Pierre Samuel du Pont de Nemours (1739-1817) and his son Éleuthère Irénée du Pont (1771-1834) the company began with the production of gunpowder. Established in 1903, the Experimental Station is a research facility located on the banks of the Brandywine Creek across from DuPont's first black powder works. This collection contains three documentary photographs of both sides of the lower gates of the DuPont Company Experimental Station.

The records consist of a small batch of company documents preserved by an individual after the end of operations by the Wilmington Finishing Company. They include copies of the company's charter and supplements, bylaws and amendments, and files of agreements covering water rights, easements for sewer, gas and water lines, and plant access for the Wilmington and Northern Railroad Company.

Joshua Gilpin (1765-1841) was a merchant and paper manufacturer. Thomas Gilpin (1776-1853) went into business with his brother, Joshua, establishing Delaware's first paper mill on the Brandywine Creek. James Riddle (1802-1873) owned James Riddle Son & Co., a cotton mill along the Brandywine. This collection contains miscellaneous papers from the three men, including deeds, property agreements, and a copy of Riddle's will.

This collection consists of photographs and maps depicting the property of the Brandywine Works of E.I. du Pont de Nemours & Company. The maps and blueprints show how the property of the Brandywine Works was divided among du Pont family members for estates after the works closed. A small series of large-format photographs depict various scenes and events from the Brandywine Works and the city of Wilmington in general.

The Reading Company, chartered in 1871 as the Excelsior Enterprise Company, became the holding company for the system of railroads, canals and coal mines assembled by the predecessor Philadelphia & Reading Railroad Company between 1833 and 1896. The Reading Company employment and real estate records comprise a largely incomplete and extremely fragmentary synthetic collection of material related to the Philadelphia & Reading Railroad Company and its successors. The collection comprises incomplete employment records largely dating from the first half of the twentieth century, records related to the employee pension program and the Relief Association, a small amount of contracts, and deeds and agreements reflecting the company's process of land acquisition following initial main line construction in the 1830s and through to the early twentieth century.

This collection reflects material from a small amount of manufacturers operating in the Philadelphia and Trenton, New Jersey, largely in the early-to-mid 19th century. The records primarily include correspondence, bills, receipts, and accounts. There are also various legal papers and testimonies concerning suits involving land and water rights in Burlington County, New Jersey, with descriptions of miscellaneous dams, saw, grist, woolen, and fulling mills.

William Young (1755-1829) was a Philadelphia bookseller and later a manufacturer at Rockland, Delaware. Three surveyor's plats marking the route of canal through White-Hall estate, William Young's property in Philadelphia.