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.

E.I. du Pont de Nemours & Company Repauno Works manufactured high explosive dynamite. The company began as the Repauno Chemical Company on June 7, 1880, by Lammot du Pont (1831-1884), a chemist working for the family business, E.I. du Pont de Nemours & Company, a chemical company which originally produced gunpowder. The panoramic photographs show two views of the dynamite works and workers village at the DuPont Company's Repauno Works.

John Watson (1774-1864), a Quaker, worked as a land surveyor in Pennsylvania during the early nineteenth century. The collection consists of five volumes relating to the construction of the Delaware Division of the Pennsylvania Canal.

Martha Furnace was an iron plantation built in 1793 by the Pennsylvania ironmaster Isaac Potts (1750-1803) on a branch of the Wading River two miles above Harrisville in eastern Burlington County, New Jersey. The volume is a combined daybook and diary, containing a comprehensive account of the operation of a Pine Barrens iron plantation during the early 1800s.