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Cambria Iron and Steel Works, Johnstown, PA, circa 1880.
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Cambria Iron and Steel Works, Johnstown, Pa.

Credit: Courtesy of the Pennsylvania State Archives

First developed in 1848 by Daniel J. Morrell, the Cambria Iron Company in 1871 built a state-of-the-art Bessemer steel plant directed by Captain William Jones. Johnstown grew up around the Cambria mills. At the height of the steel industry in Johnstown, mills spread out over 13 miles along the Conemaugh, Little Conemaugh, and Stonycreek Rivers.

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