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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Conservation. Scrap iron and steel. Steel for national defense. Scrap iron to feed the hungry furnaces of the steel mills (at least fifty percent scrap must be used in the open hearth process)." The New York Public Library Digital Collections. 1941. https://old-digitalcollections.nypl.org/items/fb35dd10-d85b-013e-fb61-0242ac110002
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Conservation. Scrap iron and steel. Steel for national defense. Scrap iron to feed the hungry furnaces of the steel mills (at least fifty percent scrap must be used in the open hearth process)." New York Public Library Digital Collections. Accessed October 8, 2026. https://old-digitalcollections.nypl.org/items/fb35dd10-d85b-013e-fb61-0242ac110002
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1941). Conservation. Scrap iron and steel. Steel for national defense. Scrap iron to feed the hungry furnaces of the steel mills (at least fifty percent scrap must be used in the open hearth process). Retrieved from https://old-digitalcollections.nypl.org/items/fb35dd10-d85b-013e-fb61-0242ac110002
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/fb35dd10-d85b-013e-fb61-0242ac110002 | title=
(still image)
Conservation. Scrap iron and steel. Steel for national defense. Scrap iron to feed the hungry furnaces of the steel mills (at least fifty percent scrap must be used in the open hearth process)., (1941)|author=Digital Collections, The New York Public Library |accessdate=October 8, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>