by David W. Clark
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National Water-Quality Assessment Progra...
Pesticides in soils and ground water in ...
Ground-water resources and simulated eff...
Geochemical processes in ground water re...
Ground-water resources of northern Utah ...
Joe's Letters
Nightmares & Dreamscapes
Doyle Drive
Water-quality assessment of part of the ...
Water-level changes in the High Plains A...
Particle-tracking analysis of contributi...
Water-level changes in the High Plains a...