In response to the need to examine the large amount of historic water-quality data comprehensively across North Dakota and evaluate the efficiency of the State-wide sampling programs, a study was done by the U.S. Geological Survey in cooperation with the
Galloway, Joel M. jgallowa@usgs.gov,Vecchia, Aldo V.,Vining, Kevin C. kcvining@usgs.gov,et al. Evaluation of water-quality characteristics and sampling design for streams in North Dakota, 1970???2008. 2012-01-01.