1. Quality of ground water in the coastal plain physiographic province of Virginia Author/Creator: Focazio, Michael J., author Publication/Creation: Richmond, Virginia : U.S. Geological Survey, 1993 Resource Type: Book Access & Availability: Loading
2. Quality-assurance data for routine water analysis in the laboratories of the U.S. Geological Survey for water year 1990 Author/Creator: Maloney, Thomas J., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 1993 Resource Type: Book Access & Availability: Loading