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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Tapping the slag at a blast furnace, Pittsburgh, Pennsylvania" The New York Public Library Digital Collections. 1938. https://digitalcollections.nypl.org/items/f574ecc0-ff33-0137-c91c-5fca48c7f0c6
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Tapping the slag at a blast furnace, Pittsburgh, Pennsylvania" New York Public Library Digital Collections. Accessed January 17, 2025. https://digitalcollections.nypl.org/items/f574ecc0-ff33-0137-c91c-5fca48c7f0c6
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1938). Tapping the slag at a blast furnace, Pittsburgh, Pennsylvania Retrieved from https://digitalcollections.nypl.org/items/f574ecc0-ff33-0137-c91c-5fca48c7f0c6
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