Johnson, Gregory C.

• Environmental setting and water-quality issues of the Mobile River basin, Alabama, Georgia, Mississippi, and Tennessee
• Factors affecting groundwater quality in the Valley and Ridge aquifers, eastern United States, 1993-2002
• Shallow ground-water quality adjacent to burley tobacco fields in northeastern Tennessee and southwestern Virginia, Spring 1997
• Water quality of springs in the Valley and Ridge Physiographic Province in the upper Tennessee River basin, 1997