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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Guernsey heifer at the Casa Grande Valley Farms. Pinal County, Arizona. Her dam on test yielded 760 pounds of butterfat in 365 days, milked about twice a day. "A great Guernsey" the herdman said" The New York Public Library Digital Collections. 1940. https://digitalcollections.nypl.org/items/318e7b00-54bd-0137-d93e-71c7459d20cf
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Guernsey heifer at the Casa Grande Valley Farms. Pinal County, Arizona. Her dam on test yielded 760 pounds of butterfat in 365 days, milked about twice a day. "A great Guernsey" the herdman said" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/318e7b00-54bd-0137-d93e-71c7459d20cf
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1940). Guernsey heifer at the Casa Grande Valley Farms. Pinal County, Arizona. Her dam on test yielded 760 pounds of butterfat in 365 days, milked about twice a day. "A great Guernsey" the herdman said Retrieved from https://digitalcollections.nypl.org/items/318e7b00-54bd-0137-d93e-71c7459d20cf
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(still image)
Guernsey heifer at the Casa Grande Valley Farms. Pinal County, Arizona. Her dam on test yielded 760 pounds of butterfat in 365 days, milked about twice a day. "A great Guernsey" the herdman said, (1940)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>