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- 20:17, 17 April 2018 Debra Tabron (talk | contribs) uploaded File:USEPA-2014. Passive Samplers for INvestigations of Air Quality.pdf (U.S. Environmental Protection Agency (USEPA). 2014. Passive Samplers for Investigations of Air Quality: Method Description, Implementation, and Comparison to Alternative Sampling Methods. EPA/600/R-14/434.)