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• Industry (2) + -
• Pennsylvania (2) + -
• Steel industry and trade (2) + -
• Steel works (2) + -
• Blast furnaces (1) + -
• Buildings (1) + -
• Design and construction (1) + -
• Downtown (Pittsburgh, Pa.) (1) + -
• Foundry ladles (1) + -
• Gulf Building (Pittsburgh, Pa.) (1) + -

• Ingot molds (1) + -
• Interiors (1) + -
• Jones & (1) + -
• Laughlin Steel Corporation. (1) + -
• Monongahela River (W. Va. and Pa.) (1) + -
• Panoramic views (1) + -
• Pennsylvania. (1) + -
• Pittsburgh. (1) + -
• Smokestacks (1) + -
• Soho (Pittsburgh, Pa.) (1) + -
• Steel framing (Building) (1) + -