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Edgar Thomson Steel Works 
Name: Edgar Thomson Steel Works
Collection: Vogel Slide Collection
Site: U.S. Steel
Unit: 4
Piece: 6-18
Structure: Overview
Photo credit: Robert M. Vogel
Photo date: 1974-04-29
Notes: Overview photograph of the Edgar Thomson Steel Works in Braddock, Pennsylvania. The plant was constructed by Andrew Carnegie to use the new Bessemer Process to produce steel rails. Production began in 1875.
Meese, Hugh P.
1917 Edgar Thompson Steel Works in The Unwritten History of Braddock's Field.
http://www.15122.com/3rivers/History/BraddocksField/index.htm