Factors affecting spatial and temporal variability in nutrient and pesticide concentrations in the surficial aquifer on the Delmarva Peninsula [electronic resource] / by Linda M. Debrewer, Scott W. Ator, and Judith M. Denver.
Mode of access: Internet from the USGS web site. Address as of 5/31/07: http://pubs.usgs.gov/sir/2005/5257/pdf/sir-2005-5257.pdf; current access is available via PURL.