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Study area including sites within US Fish and Wildlife (USFWS) Waterfowl Production Areas and National Wildlife Refuges in Montana and North Dakota, USA, where we collected waterborne, interrenal and ambient CORT samples. See Table 1 for site attributes.Baselayer sources: Esri, HERE, Garmin, SafeGraph, FAO, METI/NASA, USGS, EPA, NPS, NOAA, State of North Dakota.
