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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Taking butter out of churns at the Dairymen's Cooperative Creamery. Caldwell, Canyon County, Idaho. These are some of the most modern churns in the United States. All butter of this creamery is marketed through the Challenge Butter and Cream Association," The New York Public Library Digital Collections. 1941. https://old-digitalcollections.nypl.org/items/85964010-8571-0137-3c12-47a0182781f6
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Taking butter out of churns at the Dairymen's Cooperative Creamery. Caldwell, Canyon County, Idaho. These are some of the most modern churns in the United States. All butter of this creamery is marketed through the Challenge Butter and Cream Association," New York Public Library Digital Collections. Accessed October 10, 2026. https://old-digitalcollections.nypl.org/items/85964010-8571-0137-3c12-47a0182781f6
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1941). Taking butter out of churns at the Dairymen's Cooperative Creamery. Caldwell, Canyon County, Idaho. These are some of the most modern churns in the United States. All butter of this creamery is marketed through the Challenge Butter and Cream Association, Retrieved from https://old-digitalcollections.nypl.org/items/85964010-8571-0137-3c12-47a0182781f6
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/85964010-8571-0137-3c12-47a0182781f6 | title=
(still image)
Taking butter out of churns at the Dairymen's Cooperative Creamery. Caldwell, Canyon County, Idaho. These are some of the most modern churns in the United States. All butter of this creamery is marketed through the Challenge Butter and Cream Association,, (1941)|author=Digital Collections, The New York Public Library |accessdate=October 10, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>