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Keywords:Bethlehem Steel, Bethlehem Steel Corporation, HMT, Industrial, Machinery, North America, PA, Pennsylvania, Spring, Steel Stacks, The Hoover Mason Trestle, United States, abandoned, blast, blue hour, bolts, close up, colors, equipment, evening, furnaces, gear, gears, historic, iconic, illuminated, landmark, light, lit, manufacturing, mechanical, nuts, oxidation, oxidized, rust, rusted, rusty, seasons, stack, stacks, steel, tanks, twilight, vintage
