TY - RPRT TI - Trends in major-ion constituents and properties for selected sampling sites in the Tongue and Powder River watersheds, Montana and Wyoming, based on data collected during water years 1980-2010 AU - Steven K. Sando AU - Aldo V. Vecchia AU - Elliott P. Barnhart AU - Roy Sando AU - Melanie L. Clark AU - David L. Lorenz PY - 2014 DO - 10.3133/sir20135179 UR - https://pubs.usgs.gov/publication/sir20135179 ID - sir20135179 ER -