by Peter B. McMahon
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Water-quality assessment of the High Pla...
Vertical gradients in water chemistry in...
Vertical gradients in water chemistry an...
A reconnaissance study of the effect of ...
Water movement through thick unsaturated...
Ground-water flow, geochemistry, and eff...
Nitrate occurrence in U.S. waters (and r...
Water-quality assessment of the Ozark Pl...
Selected ground-water-quality data for t...
Nitrate and other water-quality characte...
Nitrates in groundwater