by David W. Clark
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Pesticides in soils and ground water in ...
Plan of study for the Regional Aquifer-S...
Ground-water resources and simulated eff...
Geochemical processes in ground water re...
Ground-water resources of northern Utah ...
Joe's Letters
Water-quality assessment of the central ...
National Water-Quality Assessment Progra...
NAWQA, National Water-Quality Assessment...
National water-quality assessment