Black and white photograph of Mr. Poppe, Otto Haas (1872-1960), and Mr. Kaullain in front of a tennis court with rackets.

Black and white photograph group photograph featuring Otto Haas (1872-1960) and friends visiting from Germany. Haas, the cofounder of Rohm and Haas is pictured second from the right.

Black and white photograph of Otto Rohm (1876-1939), co-founder of Rohm and Haas.

Illustration of the Rohm and Haas factory in Darmstadt, Germany.

The Rohm and Haas Company was founded in 1907 in Esslingen, Germany through the partnership of German chemist Otto Röhm and German businessman Otto…

Black and white group photograph featuring Otto Haas (1872-1960) with workers and their families at the Rohm and Haas plant in Bristol, Pennsylvania.

Street view depicting the exterior of the Rohm and Haas Company home office building located at West Washington Square in Philadelphia.

The Rohm and Haas Company was founded in 1907 in Esslingen, Germany through the…

General view of an unidentified employee at work in a laboratory at the Rohm and Haas Company home office located at West Washington Square in Philadelphia.

The Rohm and Haas Company was founded in 1907 in Esslingen,…

General view of exposure racks designed to test the weathering capabilities of varnishes and other products manufactured by the Rohm and Haas Company. The racks are positioned on the roof of the company's home office…

Four photographs depicting various German automobiles with Plexiglas windshields and window panels. Per notations accompanying the photographs, the automobiles are identified as follows: 1) Opel Super 6…

Black and white photograph of Otto Haas (1872-1960), cofounder of Rohm and Hass, and his wife Phoebe Waterman Haas (1882-1967).

Phoebe Haas was one of the first American women to earn her doctorate in astronomy in…

General view of a research laboratory for resinous products at the Rohm and Haas Company home office located at West Washington Square in Philadelphia.

The Rohm and Haas Company was founded in 1907 in Esslingen,…

General view of the Resin Research Laboratory at the Rohm and Haas Company home office located at West Washington Square in Philadelphia.

The Rohm and Haas Company was founded in 1907 in Esslingen, Germany through the…

General view of the Varnish Laboratory at the Rohm and Haas Company home office located at West Washington Square in Philadelphia.

The Rohm and Haas Company was founded in 1907 in Esslingen, Germany through the…

Exterior view of a section of the aluminum-chloride department at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

General view of the exterior of the Amberol manufacturing facility (Building R1) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the…

General view of the exterior of the bowling alley at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of Philadelphia,…

General view of the carpenter shop (Building 57), power house (Building 43), and warehouse (Building 53) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the…

General view of the exterior of the clubhouse facility at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

Exterior view of the Cooper Shop at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of Philadelphia, Pennsylvania.…

Exterior view of the copper oxide and bauxite silos (Building 5) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

Exterior view of the copper oxide, bauxite silos, and bauxite grinding facilities (Building 5) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware…

General view of the east side of the sulphuric acid contact plant (Building 41) and adjacent railroad tracks at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the…

General view of the exterior of the garage (Building 54) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast section of…

General view of the exterior of the laboratory facilities (Building 51) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast…

General view of the exterior of the laboratory facilities (Building 51) at the Charles Lennig and Company chemical manufacturing plant in Bridesburg, a neighborhood located along the Delaware River in the Northeast…