Earth Observations from NASA Aircraft
Application of Gas Flotation and Foam Separation for the Treatment of Tar Sand Wastewaters
Nutrients in Shallow Ground Waters Beneath Relatively Undeveloped Areas in the Conterminous United States
Treatment of Tar Sand Wastewaters by Air Flotation with Polymer Addition
Nitrate in Ground Waters of the United States
Uncertainty of a Sampling Program for Monitoring the Pollution Potential of an Agricultural Field
Modeling Approaches for Assessing the Risk of Nonpoint-source Contamination of Ground Water
Water Resources of Teton County, Wyoming, Exclusive of Yellowstone National Park
Nitrate in the Ground Waters of the United States
St. Meinrad Historical Essays
But Not Conquered
Nutrients in Ground Waters of the Conterminous United States, 1992-1995
Nutrients in Ground Waters of the Conterminous United States, 1992-1995