Allegheny Furnace (ca.1826/30-ca.1850), Armstrong Co.
American Furnace (ca.1846- 1860), Armstrong Co.
Anderson & Buffington Foundry, Armstong Co.
Anderson & Marshall Foundry, Armstrong Co.
Apollo Iron and Brass Foundry, Armstrong Co.
          See: Apollo Iron Works, Armstrong Co.
Apollo Iron Works, Armstrong Co.
Apollo Rolling  Mill (ca.1856-   ), Armstrong Co.
Armstrong Furnace (ca.1826-   ), Armstrong Co.
          See: Allegheny Furnace, Armstrong Co.
Bear Creek Furnace (ca.1818-1855), Armstrong Co.
          See also: Pittsburgh Rolling Mill (ca.1811-   ), Allegheny Co.
                        Union Rolling Mill (ca.1819-1829), Allegheny Co.
Biddle Furnace (ca.1825-1855), Armstrong Co.
Boner Furnace, Armstrong Co.
          See: Cowanshannock Furnace, Armstrong Co.
Bonner Furnace, Armstrong Co.
          See: Cowanshannock Furnace, Armstrong Co.
Brady's Bend Furnaces (ca.1840-1874), Armstrong Co.
          See: Great Western Iron Works, Armstrong Co.
Brady's Bend Iron Company (1849-1873), Armstrong Co.
          See: Great Western Iron Works, Armstrong Co.
Brady's Bend Nail Factory, Armstrong Co.
          See: Great Western Iron Works, Armstrong Co.
Brady's Bend Rolling Mill (ca.1841-1874), Armstrong Co.
          See: Great Western Iron Works, Armstrong Co.
Brady's Bend Iron Works, Armstrong Co.
          See: Great Western Iron Works, Armstrong Co.
Brown & Mosgrove Furnace, Armstrong Co.
          See: Pine Creek Furnace, Armstrong Co.
Brown's Furnace, Armstrong Co.
          See: Cowanshannock Furnace, Armstrong Co.
                  Monticello Furnace, Armstrong Co.
Buffalo Furnace No.1 (ca.1839-1865), Armstrong Co.
          See: Buffalo Furnaces, Armstrong Co.
Buffalo Furnace No.2 (ca.1846-1865), Armstrong Co.
          See: Buffalo Furnaces, Armstrong Co.
Buffalo Furnaces, Armstrong Co.
Caldwell's Furnace, Armstrong Co.
          See: Mahoning Furnace, Armstrong Co.
Coldwell's Furnace, Armstrong Co.
          See: Mahoning Furnace, Armstrong Co.
Colwell's Furnace, Armstrong Co.
          See: Mahoning Furnace, Armstrong Co.
Cowanshannock Furnace (ca.1845-1851), Armstrong Co.
Donelly Furnace, Armstong Co.
          See: Dudley Furnace, Butler Co.
Graff's Furnace, Armstrong Co.
          See: Buffalo Furnaces, Armstrong Co.
Great Western Furnace No. 1, (ca.1840-1849), Armstrong Co.
Great Western Furnace No. 2 (ca.1841-1849), Armstrong Co.
Great Western Furnace No. 3 (ca.1843-1849), Armstrong Co.
Great Western Furnace No. 4 (ca.1846-1849), Armstrong Co.
Great Western Furnaces, Armstrong Co.
Great Western Iron Company (ca.1840-1849), Armstrong Co.
              See: Great Western Furnaces, Armstrong Co.
Great Western Iron Works, Armstrong Co.
              See: Great Western Furnaces, Armstrong Co.
Great Western Rolling Mill (ca.1841-1849), Armstrong Co.
Gruff's Furnace, Armstrong Co.
              See: Buffalo Furnaces, Armstrong Co.
Mahoning Furnace (ca.1845-1860), Armstrong Co.
Mahoning Furnace No. 2 (ca.1860-1878), Armstrong Co.
Mc Crea's Furnace, Armstrong Co.
             See: Olney Furnace, Armstrong Co.
Mc Cucheon's Furnace (ca.1845-1857), Armstrong Co.
             See: Ore Hill Furnace (ca.1845-1857), Armstrong Co.
Mc Farland's Furnace, Armstrong Co.
             See: Phoenix Furnace (ca.1846-1853), Armstrong Co.
Mc Nickles's Furnace, Armstrong Co.
             See: Allegheny Furnace (ca.1826/30-1850), Armstrong Co.
                    Biddle Furnace (ca.1825-1855), Armstrong Co.
Monticello Furnace (ca.1859-1876), Armstrong Co.
Nichol's Furnace, Armstrong Co.
             See: Allegheny Furnace (ca.1826/30-1850), Armstrong Co.
Olney Furnace (ca.1847-1856), Armstrong Co.
Ore Hill Furnace (ca.1845-1857), Armstrong Co.
P. Graff & Company Furnace, Armstrong Co.
            See: Buffalo Furnaces, Armstrong Co.
Phoenix Furnace (ca.1846-1853), Armstrong Co.
Pine Creek Furnace (ca.1845/46-1879), Armstrong Co.
Rebecca Furnace (ca.1880-1906), Armstrong Co.
Rebecca Furnace No. 2 (ca.1906- ? ), Armstrong Co.
Red Bank Furnace "Old" (ca.1841/42-1855), Armstrong Co.
Redbank Furnace "Old", Armstrong Co.
            See: Red Bank Furnace (ca.1841/42-1855), Armstrong Co.
Reynolds' & Richie's Furnace, Armstrong Co.
            See: Red Bank Furnace "Old", Armstrong Co.
Reynolds' & Schunk's Furnace, Armstrong Co.
            See: Red Bank Furnace "Old", Armstrong Co.
Reynolds' Furnace, Armstrong Co.
            See: Red Bank Furnace "Old", Armstrong Co.
Rock Furnace, Armstrong Co.
            See: Red Bank Furnace "Old", Armstrong Co.
Rock Furnace, Armstrong Co.
            See: Biddle Furnace, Armstrong Co.
Rough Furnace, Armstrong Co.
            See: Biddle Furnace, Armstrong Co.
Siberian Iron Works (ca.1872- ? ), Armstrong Co.
Siberian Rolling Mill (ca.1872- ? ), Armstrong Co.
            See: Siberian Iron Works, (ca.1872- ? ), Armstrong Co.
            See also: Iron City Iron Works, Armstrong Co.