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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Safety engineer with rock dust traps to prevent spread of mine explosions. Old Ben number eight. West Frankfort, Illinois" The New York Public Library Digital Collections. 1939. https://digitalcollections.nypl.org/items/655701d0-c9f5-0138-8688-778f659ae993
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Safety engineer with rock dust traps to prevent spread of mine explosions. Old Ben number eight. West Frankfort, Illinois" New York Public Library Digital Collections. Accessed May 6, 2024. https://digitalcollections.nypl.org/items/655701d0-c9f5-0138-8688-778f659ae993
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). Safety engineer with rock dust traps to prevent spread of mine explosions. Old Ben number eight. West Frankfort, Illinois Retrieved from https://digitalcollections.nypl.org/items/655701d0-c9f5-0138-8688-778f659ae993
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/655701d0-c9f5-0138-8688-778f659ae993 | title=
(still image)
Safety engineer with rock dust traps to prevent spread of mine explosions. Old Ben number eight. West Frankfort, Illinois, (1939)|author=Digital Collections, The New York Public Library |accessdate=May 6, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>