U.S. Environmental Protection Agency Office of Research and Development, Center for Environmental Research Information, Robert S. Kerr Environmental Research Laboratory
compiled by members of the Task Committee on Ground Water Protection of the Ground Water Hydrology Committee of the Hydrology Technical Oversight Committee of the Water Resources Engineering Division of the American Society of Civil Engineers ; Nazer Ahmed, chairman ; Robert McVicker, secretary ; Thomas W. Anderson ... [and others]
United States Department of Agriculture, Agricultural Research Service and Cooperative State Research Service in cooperation with State Agricultural Experiment Stations