At the turn of the century, under the direction of Charles Schwab and Eugene Grace, Bethlehem Steel Corporation became the second largest American steel company; combined with its other venture, Bethlehem Shipbuilding Corp., it became a leading 20th century American business. This item is a viewbook which contains exterior views of the Bethlehem Steel Works. These include numerous images of both the plant and office, most of which were taken at street level.

Pierre A. Gentieu was a long-term employee of E.I. du Pont de Nemours & Company who created an invaluable photographic record of the company's Brandywine Mills at the turn of the century. 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 and his son Eleuthère Irénée du Pont the company began with the production of gunpowder. This small collection includes original drymounted photographic prints of views near Henry Clay Village in Delaware by Pierre Gentieu. Several have simple hand drawn decorative borders on them and are signed. There are also several items related to DuPont Gunpowder and rifles.

These aerial photographs of the Tyler McConnell Bridge and ground views of the nearby area of Henry Clay Village, Delaware, including the Hagley Museum and Library's entrance, were commissioned by the State of Delaware Department of Transportation. The Tyler McConnell Bridge over the Brandywine River on Route 141 (Centre Road) opened in 1952. The area was documented when research began on building another bridge to replace the current two-lane bridge. There are also views of the Charles I. du Pont house.