TY - RPRT TI - Water-quality characteristics and trend analyses for the Tongue, Powder, Cheyenne, and Belle Fourche River drainage basins, Wyoming and Montana, for selected periods, water years 1991 through 2010 AU - Melanie L. Clark PY - 2012 DO - 10.3133/sir20125117 UR - https://pubs.usgs.gov/publication/sir20125117 ID - sir20125117 ER -