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Subject
- Corporations121
- Rohm and Haas Company121
- Chemical industry99
- Pennsylvania--Philadelphia--Bridesburg44
- Charles Lennig and Company, Inc.43
- Plexiglas37
- Plastics industry and trade21
- Employees17
- Aerial photographs15
- Architecture15
- Aerial views11
- Pennsylvania--Philadelphia9
- Plastics9
- Aircraft industry7
- Laboratories7
- World War (1939-1945)6
- Airplanes, Military5
- Scientific apparatus and instruments5
- Belluschi, Pietro, 1899-19944
- Emulsions4