by Michael Rupert
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Ground-water age and flow at Great Sand ...
Ground-water flow direction, water quali...
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3 guys naked from the waist down
National Water-Quality Assessment Progra...
Probability of detecting atrazine/deseth...
Acid Mine Drainage, Rock Drainage, and A...
Acid-neutralizing potential of minerals ...
Acid Mine Drainage
Acid-neutralizing potential of igneous b...
Sources of coal-mine drainage and their ...
Effects of coal-mine discharges on the q...