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  1. By: Mark E. Taylor & Associates. - Ontario. Ministry of the Environment. - Metropolitan Toronto and Region Conservation Authority.
    Publication info: Toronto, Ont, Mark E. Taylor & Associates, 1992
    Holding Institution: Ontario Ministry of the Environment
    Subjects: Biological treatment  Constructed wetlands  Function  Ontario  Purification  Sewage  Sewage lagoons  Storm sewers  Storm water retention basins  Urban runoff  Water  Water quality management  Wetlands  
  2. By: Eby, Harry J. - Hsingh, V. P.
    Publication info: Washington, D.C, Agricultural Research Service, U.S. Dept. of Agriculture, 1972
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Biological treatment  Cyanobacteria  Purification  Sewage  Sewage lagoons  
  3. By: California. Department of Water Resources. - Brown, Randall L.
    Publication info: Sacramento], For sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington, 1971
    Holding Institution: University of California Libraries
    Subjects: Algae  Biological treatment  Nitrates  Nitrogen removal  Purification  Water  
  4. By: California. Department of Water Resources. - United States. Environmental Protection Agency. - United States. Bureau of Reclamation.
    Publication info: Washington, For sale by the Supt. of Docs., U.S. Govt. Print. Off, 1971
    Holding Institution: University of California Libraries
    Subjects: Algae  Biological treatment  Nitrates  Purification  Water  
  5. By: Rideal, Samuel,
    Edition: 3d ed.
    Publication info: London, The Sanitary publishing co, 1906
    Holding Institution: University of Toronto - Gerstein Science Information Centre
    Subjects: Bacteria  Biological treatment  Sewage disposal  Sewage Purification