• 243 Middleton Shelving Facility
• 53 Memorial Library
• 36 Steenbock Library
• 18 Wendt Commons Library - Closed
• 14 Verona Shelving Facility
• 11 Wisconsin Historical Society Library
• 7 Geology and Geophysics Library (Leith)
• 7 Science Libraries Shelving Facility
• 5 Law Library
• 4 Limnology Library
• 1 Ebling Library
• 1 ILL Library

• 7 Microforms

• 364 Sewage
• 253 Water
• 59 Biological treatment
• 58 Activated sludge process
• 56 Waste disposal
• 52 Filtration
• 46 Groundwater
• 38 Sewage disposal plants
• 35 Pollution
• 32 Sewage disposal
• 29 Environmental aspects
• 28 Aeration
• 28 Chlorination
• 26 Drinking water
• 23 Water quality management
• 23 Water reuse
• 21 Water quality
• 21 Water treatment plants
• 20 Carbon, Activated
• 19 Reverse osmosis process
• 18 Factory and trade waste
• 18 Wood-pulp industry
• 17 Ion exchange process
• 17 Sewage sludge

• 57 United States. Environmental Protection Agency. Office of Research and Development
• 47 United States. Environmental Protection Agency. Office of Research and Monitoring
• 30 United States
• 22 United States. Environmental Protection Agency
• 20 Municipal Environmental Research Laboratory
• 19 United States. Federal Water Quality Administration
• 17 National Council of the Paper Industry for Air and Stream Improvement (U.S.)
• 14 United States. Environmental Protection Agency. Water Quality Office
• 13 Industrial Environmental Research Laboratory (Cincinnati, Ohio)
• 12 Center for Environmental Research Information (U.S.)
• 10 Robert S. Kerr Environmental Research Laboratory
• 10 Small Scale Waste Management Project (Wis.)
• 10 United States. Federal Water Pollution Control Administration
• 10 University of Texas at Austin. Environmental Health Engineering Research Laboratory
• 9 Advanced Waste Treatment Research Laboratory
• 9 Malina, Joseph F., 1935-2016
• 8 United States. Environmental Protection Agency. Office of Technology Transfer
• 8 United States. Office of Water Resources Research
• 8 University of Wisconsin--Extension
• 7 United States. Environmental Protection Agency. Office of Water Program Operations
• 7 United States. Office of Water Research and Technology
• 7 Wisconsin. Department of Natural Resources
• 6 Boyle, William C. (William Charles), 1936-
• 6 National Council for Air and Stream Improvement
• 6 New Mexico Water Resources Research Institute

• 626 English

• 52 United States
• 22 Wisconsin
• 8 California
• 5 North Carolina
• 4 Hawaii
• 4 Mississippi
• 3 Maryland
• 3 Michigan
• 3 Virginia
• 2 Colorado
• 2 Great Lakes (North America)
• 2 Great Lakes Region (North America)
• 2 Massachusetts
• 2 Minnesota
• 2 Muskegon County
• 2 New York (State)
• 2 Ontario
• 1 Baltimore
• 1 Binghamton
• 1 Binghamton (N.Y.)
• 1 Boulder
• 1 Cedar Rapids
• 1 Chesapeake Bay (Md. and Va.)
• 1 Chesapeake Bay Watershed
• 1 Claytor Lake

Limit year range