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• Steel industry and trade (32) + -
• Steel works (31) + -
• Industry (30) + -
• Bethlehem Steel Company. (17) + -
• Pennsylvania. (17) + -
• Pennsylvania (16) + -
• Interiors (12) + -
• Johnstown. (12) + -
• Smoke (11) + -
• Steel workers (10) + -

• Men (9) + -
• Smokestacks (8) + -
• Air Pollution (6) + -
• Pittsburgh. (6) + -
• Foundry ladles (5) + -
• Railroad Tracks (5) + -
• Blast furnaces (3) + -
• Cobblestones (3) + -
• Houses (3) + -
• Housing (3) + -
• Iron and steel workers (3) + -
• Neighborhoods (3) + -
• Rivers (3) + -
• Streets (3) + -
• Allegheny River (Pa. and N.Y.) (2) + -
• Automobiles (2) + -
• Bridges (2) + -
• Urban life (2) + -
• Barges (1) + -
• Commercial buildings (1) + -
• Hot Metal Bridge (Pittsburgh, Pa.) (1) + -
• Industrial buildings (1) + -
• Ingot molds (1) + -
• Ingots (1) + -
• Johnstown (Pa.) (1) + -
• Jones & (1) + -
• Landscape (1) + -
• Laughlin Steel Corporation. (1) + -
• Laundry (1) + -
• Lawrenceville (Pittsburgh, Pa.) (1) + -
• Monongahela River (W. Va. and Pa.) (1) + -
• Open-hearth furnaces (1) + -
• Panoramic views (1) + -
• Pittsburgh Valve Foundry and Construction Company (Pittsburgh, Pa.) (1) + -
• Railroad freight cars (1) + -
• Railroads (1) + -
• South Side (Pittsburgh, Pa.) (1) + -
• Stairs (1) + -
• Street-railroads (1) + -
• Strip District (Pittsburgh, Pa.) (1) + -