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- Agricultural machinery industry1
- Banks and banking -- United States -- History1
- Capitalists and financiers1
- Chemical warfare -- United States1
- Executives1
- Industrialists1
- Industries -- United States1
- Insurance companies -- United States1
- Life insurance -- History[remove]1
- Steel industry and trade -- United States1
- World War, 1914-19181
- World War, 1939-19451