by Gary W. Levings
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Selected hydrogeologic data for the Big ...
Selected hydrogeologic data from the nor...
Preliminary appraisal of ground water in...
Selected drill-stem-test data from the n...
Selective annotated bibliography of grou...
Summary of the San Juan structural basin...
Nuclear waste
Hazardous waste
Snow Falling on Cedars
Pesticides
Status of ground-water resources at U.S....
Hydrologic data, 1964