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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Small farmers hire a scientist. Measuring the butter fat content in a sample of milk. Every farmer today must make use of the modern methods if he is to obtain the maximum income from his farm. Black Hawk County, Iowa" The New York Public Library Digital Collections. 1939. https://qa-digitalcollections.nypl.org/items/305f25f0-73bf-0139-2851-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Small farmers hire a scientist. Measuring the butter fat content in a sample of milk. Every farmer today must make use of the modern methods if he is to obtain the maximum income from his farm. Black Hawk County, Iowa" New York Public Library Digital Collections. Accessed December 20, 2024. https://qa-digitalcollections.nypl.org/items/305f25f0-73bf-0139-2851-0242ac110003
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). Small farmers hire a scientist. Measuring the butter fat content in a sample of milk. Every farmer today must make use of the modern methods if he is to obtain the maximum income from his farm. Black Hawk County, Iowa Retrieved from https://qa-digitalcollections.nypl.org/items/305f25f0-73bf-0139-2851-0242ac110003
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/305f25f0-73bf-0139-2851-0242ac110003 | title=
(still image)
Small farmers hire a scientist. Measuring the butter fat content in a sample of milk. Every farmer today must make use of the modern methods if he is to obtain the maximum income from his farm. Black Hawk County, Iowa, (1939)|author=Digital Collections, The New York Public Library |accessdate=December 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>