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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Tractor on the Aldridge Plantation, Mississippi. One man and a four-row cultivator does the work of eight men and eight mules under the one man-one mule system which is still common" The New York Public Library Digital Collections. 1937. https://digitalcollections.nypl.org/items/81ff1af0-8851-0136-01af-0ad97fa0c984
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Tractor on the Aldridge Plantation, Mississippi. One man and a four-row cultivator does the work of eight men and eight mules under the one man-one mule system which is still common" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/81ff1af0-8851-0136-01af-0ad97fa0c984
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1937). Tractor on the Aldridge Plantation, Mississippi. One man and a four-row cultivator does the work of eight men and eight mules under the one man-one mule system which is still common Retrieved from https://digitalcollections.nypl.org/items/81ff1af0-8851-0136-01af-0ad97fa0c984
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/81ff1af0-8851-0136-01af-0ad97fa0c984 | title=
(still image)
Tractor on the Aldridge Plantation, Mississippi. One man and a four-row cultivator does the work of eight men and eight mules under the one man-one mule system which is still common, (1937)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>