1. Groundwater quality data from the national water-quality assessment project, May 2012 through December 2013;Arnold,2016
2. Datasets from groundwater-quality data from the National Water-Quality Assessment Project, January through December 2014 and select quality-control data from May 2012 through December 2014;Arnold,2017
3. Datasets from groundwater-quality and select quality-control data from the National Water-Quality Assessment Project, January through December 2015, and previously unpublished data from 2013-2014;Arnold,2018
4. Datasets from groundwater-quality and select quality-control data from the National Water-Quality Assessment Project, january through december 2016, and previously unpublished data from 2013 to 2015;Arnold,2020
5. Volatile organic chemical contamination of groundwater resources in the U.S;Barbash;J. Water Pollut. Control Fed.,1986