Has Surface Water Quality Improved Since the Clean Water Act?
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On the fortieth anniversary of the Clean Water Act this paper reports the first quantitative assessment of the aggregate trends in water quality in the U.S. using a single standard over the years 1975 to 2011. The analysis suggests that fresh water lakes for the nation as a whole are about at the
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美国国家经济研究局创建时间：
2012-06-01
