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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Experimental spray. Prince Georges County, Beltsville, Maryland. The problem is to find a spray destructive to insects but not to humans." The New York Public Library Digital Collections. 1935-08. https://digitalcollections.nypl.org/items/ba309cea-900c-4288-e040-e00a18066c61
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Experimental spray. Prince Georges County, Beltsville, Maryland. The problem is to find a spray destructive to insects but not to humans." New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/ba309cea-900c-4288-e040-e00a18066c61
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1935-08). Experimental spray. Prince Georges County, Beltsville, Maryland. The problem is to find a spray destructive to insects but not to humans. Retrieved from https://digitalcollections.nypl.org/items/ba309cea-900c-4288-e040-e00a18066c61
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/ba309cea-900c-4288-e040-e00a18066c61 | title=
(still image)
Experimental spray. Prince Georges County, Beltsville, Maryland. The problem is to find a spray destructive to insects but not to humans., (1935-08)
|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>