E.I. du Pont de Nemours & Company is a chemical company more commonly known as the DuPont Company. It was established in 1802 and began by manufacturing gunpowder, later moving into chemical compounds. The company's Engineering Department was initially organized in 1903 as a division of the High Explosives Department, with the purpose of designing and constructing high explosives plants, powder machinery, and extensions to existing plants. This collection of DuPont Engineering records is fragmentary in nature. The surviving records are divided into four series that document a wide range of functions and represent several different time periods in the department’s evolution. The series are: Engineering Department history file; Engineering Research Laboratory; Construction Division; and Design Division, Corfam Poromeric Technology.

The Lehigh Coal & Navigation Company was a major anthracite mining and transporting firm in eastern Pennsylvania between 1822 and 1954. This collection consists of one outbound letterpress copybook dating from 1844 to 1848 of Edwin A. Douglas (1805-1859), Chief Engineer & Superintendent; three outbound letterbooks of William Reed, Chief Clerk at Mauch Chunk, dating from 1852 to 1859; thirteen outbound letterbooks of George Ruddle (1828-1904), Chief Clerk, Treasurer, and Real Estate Agent, dating from 1860 to 1878; and four inbound letterbooks of George Ruddle dating from 1870 to 1874. The letterbooks contain the correspondence of some of the chief field officers at Mauch Chunk, much of it regular exchanges with the officers at the Philadelphia headquarters.

The Wurts family were involved in the anthracite coal industry. In 1823 four brothers: Maurice Wurts (1783-1854), William Wurts (1788-1858), Charles Stewart Wurts (1790–1859), and John Wurts (1792-1861) founded the Delaware and Hudson Canal Company originally to mine anthracite coal and transport the resource to New York. The company built the Delaware and Hudson Canal and later became the Delaware and Hudson Railway. The Wurts family papers were collected by John Sparhawk Wurts (1876-1958) and reflect both family papers and business records.