• 18 Wisconsin's Water Library
• 4 Law Library
• 3 Memorial Library
• 3 Steenbock Library
• 1 Wisconsin Historical Society Library

• 63 Pollution
• 20 Purification
• 19 Water quality management
• 8 Sewage
• 8 Water quality
• 4 Analysis
• 4 Filtration
• 4 Measurement
• 4 Water treatment plants
• 3 Acid mine drainage
• 3 Activated sludge process
• 3 Aeration
• 3 Drinking water
• 3 Factory and trade waste
• 3 Law and legislation
• 3 Phosphorus content
• 3 Research
• 3 Standards
• 2 Biological treatment
• 2 Economic aspects
• 2 Effect of water pollution on
• 2 Environmental aspects
• 2 Environmental impact statements
• 2 Estuarine ecology

• 3 USA-USSR Working Group on the Prevention of Water Pollution from Municipal and Industrial Sources
• 3 United States
• 2 Environmental Monitoring and Support Laboratory (Cincinnati, Ohio)
• 2 Environmental Research Laboratory (Athens, Ga.)
• 2 Milwaukee (Wis.). Sewerage Commission
• 2 United States. Environmental Protection Agency. Office of Research and Development
• 2 United States. Environmental Protection Agency. Office of Water & Waste Management
• 2 United States. Forest Service
• 1 American Society of Planning Officials
• 1 American Water Works Association
• 1 Atterbury, Thomas J.
• 1 Battelle Memorial Institute
• 1 Battelle Memorial Institute. Columbus Laboratories
• 1 Bowles Fluidics Corporation
• 1 Bricke, Kevin
• 1 Brookhaven National Laboratory. Department of Applied Science
• 1 Brown, Donald S
• 1 Catalytic, Inc
• 1 Centaur Management Consultants
• 1 Champlin, Robert L
• 1 Chaney, Ed
• 1 Clark, Robert Maurice
• 1 Colorado State University
• 1 Conference in the Matter of Pollution of Lake Superior and its Tributary Basin in the States of Minnesota, Wisconsin, and Michigan (1971 : Duluth, Minn.)

• 89 English

• 34 United States
• 3 Florida
• 3 Texas
• 2 Galveston Bay
• 2 Galveston Bay (Tex.)
• 2 Gulf of Mexico
• 2 West (U.S.)
• 1 Alabama
• 1 Atlantic Ocean
• 1 Biscayne Bay
• 1 Boston
• 1 Cincinnati
• 1 Colorado River (Colo.-Mexico)
• 1 Conecuh River watershed
• 1 Connecticut
• 1 Great Lakes
• 1 Great Lakes (North America)
• 1 Hawaii
• 1 Laramie
• 1 Laramie (Wyo.)
• 1 Long Island Sound (N.Y. and Conn.)
• 1 Lubbock County
• 1 Massachusetts
• 1 Monongahela River (W. Va. and Pa.)
• 1 New Jersey

Limit year range