The National Stream Quality Accounting Network (NASQAN) - Some questions and answers
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[1] E. J. Gilroy,et al. An assessment of areal and temporal variations in streamflow quality using selected data from the National Stream Quality Accounting Network , 1974 .
[2] George H. Davis,et al. National System for Water Data , 1970 .
[3] M G Wolman,et al. The Nation's Rivers , 1971, Science.