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General Research Division, The New York Public Library. "Four acid drop-out cases, each 144 inches by 50 feet ; Two 60-tray Fractionating-columns ; Top of giant 174-foot column - 350 tons ; Ready to leave heavy weldshop - Fractioning column, 195 tons, 50 trays" The New York Public Library Digital Collections. 1944. https://digitalcollections.nypl.org/items/510d47dd-ff58-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Four acid drop-out cases, each 144 inches by 50 feet ; Two 60-tray Fractionating-columns ; Top of giant 174-foot column - 350 tons ; Ready to leave heavy weldshop - Fractioning column, 195 tons, 50 trays" New York Public Library Digital Collections. Accessed April 26, 2024. https://digitalcollections.nypl.org/items/510d47dd-ff58-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1944). Four acid drop-out cases, each 144 inches by 50 feet ; Two 60-tray Fractionating-columns ; Top of giant 174-foot column - 350 tons ; Ready to leave heavy weldshop - Fractioning column, 195 tons, 50 trays Retrieved from https://digitalcollections.nypl.org/items/510d47dd-ff58-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47dd-ff58-a3d9-e040-e00a18064a99 | title=
(still image)
Four acid drop-out cases, each 144 inches by 50 feet ; Two 60-tray Fractionating-columns ; Top of giant 174-foot column - 350 tons ; Ready to leave heavy weldshop - Fractioning column, 195 tons, 50 trays, (1944)
|author=Digital Collections, The New York Public Library |accessdate=April 26, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>