Normalized diurnal and between-day trends in illicit and legal drug loads that account for changes in population

Brewer AJ, Ort C, Banta-Green CJ, Berset J-D & Field JA
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Brewer, A. J., Ort, C., Banta-Green, C. J., Berset, J. D., & Field, J. A. (2012). Normalized diurnal and between-day trends in illicit and legal drug loads that account for changes in population. Environmental Science and Technology, 46(15), 8305-8314. https://doi.org/10.1021/es202447r