Water-quality variability in four reservoirs in Phillips and Valley Counties, Montana : May through August 1981 / by Rodger F. Ferreira and John H. Lambing ; prepared in cooperation with the U.S. Bureau of Land Management (U.S. Geological Survey water-resources investigations report ; 85-4209)
Water-quality variability in four reservoirs in Phillips and Valley Counties, Montana : May through August 1981 / by Rodger F. Ferreira and John H. Lambing ; prepared in cooperation with the U.S. Bureau of Land Management