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Citation
Ritter, W. F. and R. P. Eastburn. 1978. “The Uptake of Heavy Metals from Sewage Sludge Applied to Land by Corn and Soybeans.” Special Collections, USDA National Agricultural Library. Accessed November 2, 2026, https://www.nal.usda.gov/exhibits/speccoll/items/show/5602.
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