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Scientific American 1920-09-11

ScientificAmerican1920-09-11.jpg Scientific American 1912-10-12ThumbnailsScientific American 1923-11Scientific American 1912-10-12ThumbnailsScientific American 1923-11Scientific American 1912-10-12ThumbnailsScientific American 1923-11Scientific American 1912-10-12ThumbnailsScientific American 1923-11

New York's sky-line artisans: structural iron workers.