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                                General            Agricultural runoff     Feedlot     Sewage    Industrial
Reference                  (source undetermined)  (fertilizer and silt)    runoff     effluent    effluent

Boye Petersen 1917, cited
  by Olsen 1950                                                               x           x
Pirnie 1935                                                                                           x
Van Donselarr et al. 1961          x
Westlake 1961                                                                             x
Hunt 1963                          x
Spence 1964                        x
Volker and Smith 1965                                      x                              x
Kaul and Zutshi 1967                                                                      x
Lind and Cottam 1969                                       x
Peltier and Welch 1969                                                                                 x
Kohler et al. 1971                                                                        x
Stuckey 1971                                               x                              x
Perkins and Abbott 1972            x
Neel et al. 1973                                                                          x
Jupp et al. 1974                   x
Haslam et al. 1975                 x
Pieczyuska et al. 1975                                                                    x            x
Wilson et al. 1975                 x
Andersen 1976                                                                             x
Krausch 1976                       x
Pieczynska and Ozimek 1976                                                                x            x
Sahai and Sinha 1976                                                                      x
Schiemer and Prosser 1976                                                                 x
Holmes and Whitton 1977                                                                   x            x
Wiegleb 1978                                                                              x
Ho 1979                                                    x                              x
Jupp and Spence 1977a                                      x                  x           x
Fetter et al. 1978                                         x                              x            x
Haslam 1978                        x
Hejny and Husak 1978               x
Leah et al. 1978                                           x
Peterka and Hanson 1978            x
Pip 1978                           x
Ozimek 1978                                                                               x
Carpenter 1979                     x
Dunst and Nichols 1979             x
Lachavanne 1979                    x
Vass 1980                                                                                 x
Janauer 1981                       x
Merry et al. 1981                  x
Vermsak et al. 1981                                                                                    x
Shubert 1982                       x
Vander Zouwen 1982                                        x                               x
Ozimek and Kowalczewski 1984                                                              x
Filbin and Barko 1985                                     x
Madsen and Adams 1985                                     x                               x
Peverly 1985                                              x
Blake et al. 1986                                                                         x
Madsen 1986                                               x                               x
Stewart and Davies 1986                                   x                               x            x
Penuelas and Sabater 1987                                 x                                            x
Madsen et al. 1988                                                                        x

   Reference                    General            Agricultural runoff     Feedlot     Sewage    Industrial
                           (source undetermined)  (fertilizer and silt)    runoff     effluent    effluent