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George Arents Collection, The New York Public Library. "Why is corrugated iron often used on structures in preference to flat iron?" The New York Public Library Digital Collections. 1850 - 1959. https://old-digitalcollections.nypl.org/items/510d47e2-e52f-a3d9-e040-e00a18064a99
George Arents Collection, The New York Public Library. "Why is corrugated iron often used on structures in preference to flat iron?" New York Public Library Digital Collections. Accessed October 14, 2026. https://old-digitalcollections.nypl.org/items/510d47e2-e52f-a3d9-e040-e00a18064a99
George Arents Collection, The New York Public Library. (1850 - 1959). Why is corrugated iron often used on structures in preference to flat iron? Retrieved from https://old-digitalcollections.nypl.org/items/510d47e2-e52f-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47e2-e52f-a3d9-e040-e00a18064a99 | title=
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Why is corrugated iron often used on structures in preference to flat iron?, (1850 - 1959)
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