Parkhurst, David L.

• Chemical analyses of stream sediment in the Tar Creek Basin of the Picher mining area, northeast Oklahoma
• Ground-water-quality assessment of the Central Oklahoma aquifer, Oklahoma
• Ground-water-quality assessment of the central Oklahoma aquifer, Oklahoma--geochemical and geohydrologic investigations
• Reactive-transport simulation of phosphorus in the sewage plume at the Massachusetts Military Reservation, Cape Cod, Massachusetts
• User's guide to PHREEQC
• User's guide to PHREEQC (version 2)