The Edge Moor Iron Company engaged in the manufacture of iron and steel bridges at a plant located on the Delaware River north of Wilmington. The collection is comprised of a limited selection of documents, primarily connected to the liquidation of the company in 1936. It includes plant and property maps, clippings, and deeds and titles covering the property.

Helen Sellers Garrett (1857-1946) was one of Wilmington's pioneer businesswomen and served as president of the Labor Commission of Delaware. She was the daughter of one of the Edge Moor Iron Company's founders and granddaughter of abolitionist Thomas Garrett (1789-1871). The collection contains a carbon typescript report of the lawsuit of Helen S. Garrett vs. Edge Moor Iron Company, including financial statements.

The Phoenix Iron and Steel Company began in the late eighteenth century as a manufacturer of cut nails. It later became a major producer of railroad rails and iron and steel structural members. It operated as the Phoenix Iron and Steel Company from 1950 to 1959, when it was reorganized as the Phoenix Steel Corporation. This small collection primarily consists of a sample of letters received by president Samuel J. Reeves (1872-1878), primarily concerned with the Girard Avenue Bridge contract. There is also a volume of annual reports by the superintendent and a company history written by Catherine S. Sisto in 1950.

The Phoenix Steel Company began in the late eighteenth century as a manufacturer of cut nails. It later became a major producer of railroad rails and iron and steel structural members. Their records include minutes (1856-1929); stock ledgers; brief of title papers and property maps; legal and financial correspondence and tax papers; account books; and a works diary.