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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Taking sample of milk from weighing kettle to determine percentage of butter fat. Babcock test. Creamery, San Angelo, Texas" The New York Public Library Digital Collections. 1939. https://qa-digitalcollections.nypl.org/items/fbc4c1e0-3df7-0137-bc3a-47d664bdb473
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Taking sample of milk from weighing kettle to determine percentage of butter fat. Babcock test. Creamery, San Angelo, Texas" New York Public Library Digital Collections. Accessed December 20, 2024. https://qa-digitalcollections.nypl.org/items/fbc4c1e0-3df7-0137-bc3a-47d664bdb473
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1939). Taking sample of milk from weighing kettle to determine percentage of butter fat. Babcock test. Creamery, San Angelo, Texas Retrieved from https://qa-digitalcollections.nypl.org/items/fbc4c1e0-3df7-0137-bc3a-47d664bdb473
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/fbc4c1e0-3df7-0137-bc3a-47d664bdb473 | title=
(still image)
Taking sample of milk from weighing kettle to determine percentage of butter fat. Babcock test. Creamery, San Angelo, Texas, (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>