Category:Factories in Allegheny County, Pennsylvania
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This category has the following 3 subcategories, out of 3 total.
Media in category "Factories in Allegheny County, Pennsylvania"
The following 2 files are in this category, out of 2 total.
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US-PA(1891) p752 PITTSBURGH, OLIVER IRON & STEEL COMPANY.jpg 701 × 452; 218 KB
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Jones & Laughlin Pittsburgh Works 1955.ogv 21 s, 320 × 240; 957 KB