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Citation
Wiersma, G. B., H. Tai, and P. F. Sand. 1972. “Pesticides in Soil: Pesticide Residue Levels in Soils, FY 1969 - National Soils Monitoring Program.” Special Collections, USDA National Agricultural Library. Accessed August 9, 2026, https://www.nal.usda.gov/exhibits/speccoll/items/show/4532.
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