Water-quality and streamflow datasets used in the Weighted Regressions on Time, Discharge, and Season (WRTDS) models to determine trends in the Nation’s rivers and streams, 1972-2012(output)
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In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA)...
1991年，美国地质调查局（U.S. Geological Survey, USGS）启动了一项针对全美50余个主要河流流域的研究，作为全国水质评估（National Water-Quality Assessment, NAWQA）项目的组成部分……
