James M. Gerhart

Design and implementation of a sampling strategy for a water-quality assessment of the Potomac River basin

1996

Selected trace-element and organic contaminants in the streambed sediments of the Potomac River basin, August 1992

1995

National Water-Quality Assessment program

1991

Evaluation of the ground-water resources of the lower Susquehanna River basin, Pennsylvania and Maryland

1984

Evaluation of the ground-water resources of parts of Lancaster and Berks counties, Pennsylvania

1984

Digital simulation of the yield potential of the Elliot Park-Burgoon aquifer in eastern Clearfield and western Centre Counties, Pennsylvania

1977