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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Breaking virgin soil by means of tractor-drawn plow. El Indio, Texas" The New York Public Library Digital Collections. 1939. https://digitalcollections.nypl.org/items/183ad750-0d21-0137-cd9d-089578183f1f
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Breaking virgin soil by means of tractor-drawn plow. El Indio, Texas" New York Public Library Digital Collections. Accessed February 6, 2025. https://digitalcollections.nypl.org/items/183ad750-0d21-0137-cd9d-089578183f1f
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). Breaking virgin soil by means of tractor-drawn plow. El Indio, Texas Retrieved from https://digitalcollections.nypl.org/items/183ad750-0d21-0137-cd9d-089578183f1f
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/183ad750-0d21-0137-cd9d-089578183f1f | title=
(still image)
Breaking virgin soil by means of tractor-drawn plow. El Indio, Texas, (1939)|author=Digital Collections, The New York Public Library |accessdate=February 6, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>