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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Pound packages of butter at the Dairymen's Cooperative Creamery. Caldwell, Canyon County, Idaho. Challenge is a cooperative marketing association to which the co-op belongs" The New York Public Library Digital Collections. 1941. https://digitalcollections.nypl.org/items/9abc9490-8571-0137-70c2-41421f4bc0d3
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Pound packages of butter at the Dairymen's Cooperative Creamery. Caldwell, Canyon County, Idaho. Challenge is a cooperative marketing association to which the co-op belongs" New York Public Library Digital Collections. Accessed January 31, 2025. https://digitalcollections.nypl.org/items/9abc9490-8571-0137-70c2-41421f4bc0d3
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1941). Pound packages of butter at the Dairymen's Cooperative Creamery. Caldwell, Canyon County, Idaho. Challenge is a cooperative marketing association to which the co-op belongs Retrieved from https://digitalcollections.nypl.org/items/9abc9490-8571-0137-70c2-41421f4bc0d3
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/9abc9490-8571-0137-70c2-41421f4bc0d3 | title=
(still image)
Pound packages of butter at the Dairymen's Cooperative Creamery. Caldwell, Canyon County, Idaho. Challenge is a cooperative marketing association to which the co-op belongs, (1941)|author=Digital Collections, The New York Public Library |accessdate=January 31, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>