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- Title: Map of Pittsburgh, Pa. Showing the Location of its Furnaces, Rolling Mills and Steel Works. Reprinted from the Iron Age of May 8th, 1879
- Date: 1879
- Original Source: Report on the Social Statistics of Cities, Compiled by George E. Waring, Jr., United States. Census Office, Part II, 1887
- Publication Date: 1887
- Web Source: Perry-Castaneda Library Map Collection - U.S. Historical City Maps
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