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