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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Mules with guards around their muzzles to keep them from eating while working, near Vian, Oklahoma" The New York Public Library Digital Collections. 1939. https://qa-digitalcollections.nypl.org/items/82f40010-dba2-0136-f494-6f3846233168
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Mules with guards around their muzzles to keep them from eating while working, near Vian, Oklahoma" New York Public Library Digital Collections. Accessed December 21, 2024. https://qa-digitalcollections.nypl.org/items/82f40010-dba2-0136-f494-6f3846233168
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). Mules with guards around their muzzles to keep them from eating while working, near Vian, Oklahoma Retrieved from https://qa-digitalcollections.nypl.org/items/82f40010-dba2-0136-f494-6f3846233168
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/82f40010-dba2-0136-f494-6f3846233168 | title=
(still image)
Mules with guards around their muzzles to keep them from eating while working, near Vian, Oklahoma, (1939)|author=Digital Collections, The New York Public Library |accessdate=December 21, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>