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Citation
Dougherty, Ralph C. and Krystyna Piotrowska. “Screening by Negative Chemical Ionization Mass Spectrometry for Environmental Contamination With Toxic Residues: Application to Human Urines.” Special Collections, USDA National Agricultural Library. Accessed July 21, 2026, https://www.nal.usda.gov/exhibits/speccoll/items/show/1660.
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