The Edgar Thomson Steel Works was built in 1874 by the Carnegie, McCandless & Company, which was organized on January 13, 1873. William Coleman, a principal
Edgar Thomson Plant, located about 10 miles southeast of Pittsburgh in Braddock, Pa., is where basic steel production takes place at Mon Valley Works. Iron ore
Edgar Thomson Plant, located about 10 miles southeast of Pittsburgh in Braddock, Pennsylvania, is where basic steel production takes place at Mon Valley Works.
The borough was incorporated on June 8, 1867. The town's industrial economy began in 1873, when Andrew Carnegie built the a Edgar Thomson Steel Works on the
