The “DuPont and subsidiaries plant buildings and offices” subseries is the largest part of the collection, with panoramic or aerial views of various DuPont plants, mostly gunpowder or explosive plants, a few rayon and dye works plants are represented as well. Plants included are Hopewell Works, Carney’s Point, Deepwater, Repauno Works, Eastern Laboratory, Experimental Station, Parlin Works, Barksdale Explosives Plant, Hagley Yards, and Louviers, among a few others. The photographs are primarily exterior views either of the plant as a whole or of individual buildings. There are some interior views of equipment and machinery, particularly of interest are the images of Waynesboro Rayon production which were photographed by William Rittase (1894-1968). The DuPont Nitrate Company established in Chile is well documented in fifteen albums of photographs of various trips taken to Chile between 1902 and 1925?. The albums are primarily exterior views of the mines, buildings and the surrounding landscape, and some interior views of the administration office, employees and equipment. There are also loose photographs and corresponding negatives of the DuPont Nitrate Company plant. The photographer and compiler of the albums is unknown, some albums are marked as “Office copy” - images within the albums are identified and most are dated. There are also two albums of the Norwegian Nitrate Company which date from 1906 to 1916. The images show exteriors views of the plant, surrounding area, and dams.