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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Mechanization proceeds by stages. Here the tractor pulls a riding plow. Next stages are two four-row cultivators cultivating more rows and eliminating the man on the cultivator, near Centrae [?], Texas" The New York Public Library Digital Collections. 1937. https://digitalcollections.nypl.org/items/db7b95b0-8851-0136-fbca-04fb22747d1f
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Mechanization proceeds by stages. Here the tractor pulls a riding plow. Next stages are two four-row cultivators cultivating more rows and eliminating the man on the cultivator, near Centrae [?], Texas" New York Public Library Digital Collections. Accessed March 14, 2025. https://digitalcollections.nypl.org/items/db7b95b0-8851-0136-fbca-04fb22747d1f
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1937). Mechanization proceeds by stages. Here the tractor pulls a riding plow. Next stages are two four-row cultivators cultivating more rows and eliminating the man on the cultivator, near Centrae [?], Texas Retrieved from https://digitalcollections.nypl.org/items/db7b95b0-8851-0136-fbca-04fb22747d1f
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/db7b95b0-8851-0136-fbca-04fb22747d1f | title=
(still image)
Mechanization proceeds by stages. Here the tractor pulls a riding plow. Next stages are two four-row cultivators cultivating more rows and eliminating the man on the cultivator, near Centrae [?], Texas, (1937)|author=Digital Collections, The New York Public Library |accessdate=March 14, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>