Low-level nitrate export from confined dairy farming detected in North Carolina streams using ^δ15NKARR, Jonathan D; SHOWERS, William J; JENNINGS, Gregory D et al.Agriculture, ecosystems & environment. 2003, Vol 95, Num 1, pp 103-110, issn 0167-8809, 8 p.Article

Application of classification-tree methods to identify nitrate sources in ground waterSPRUILL, Timothy B; SHOWERS, William J; HOWE, Stephen S et al.Journal of environmental quality. 2002, Vol 31, Num 5, pp 1538-1549, issn 0047-2425Article

Nitrate Contamination in Groundwater on an Urbanized Dairy FarmSHOWERS, William J; GENNA, Bernard; MCDADE, Timothy et al.Environmental science & technology. 2008, Vol 42, Num 13, pp 4683-4688, issn 0013-936X, 6 p.Article