Citation
Benjamin Schwartz. undated. “Cleaning the farrowing pen. The equipment consists of a shovel, a broom or brush, plenty of hot water, soap, and lye. Swine sanitation..” Special Collections, USDA National Agricultural Library. Accessed September 23, 2026, https://www.nal.usda.gov/exhibits/speccoll/items/show/8072.
An official website of the United States government.
