1. American Public Health Association: 1971, Standard Methods for the Examination of Water and Wastewater, (13th ed.), American Public Health Association, Washington, 874 pp.
2. Huff, F. A.: 1975, ‘The Effect of Precipitation Scavenging of Airborne and Surface Pollutants on Surface and Groundwater Quality in Urban Areas’, Final Report, Surface Water Studies, Illinois State Water Survey, Urbana, 43 pp.
3. Kleusener, J. W.: 1972, ‘Nutrient Transport and Transformations in Lake Wingra, Wisconsin’, Ph.D. Thesis, University of Wisconsin, Madison, 242 pp.
4. Vollenweider, R. A.: 1968, ‘Scientific Fundamentals of the Eutrophication of Flowing Waters with Particular Reference to Nitrogen and Phosphorus Compounds’, Organization for Economic Cooperation and Development, Directorate for Scientific Affairs DAS/CSI/68.27, 159 pp.
5. Whelpdale, D. M.: 1976, ‘Dry Deposition Over the Great Lakes’, in Atmosphere — Surface Exchange of Particulate and Gaseous Pollutants, Proceedings of a Symposium at Richland, Washington, September 4–6, 1974. ERDA Symposium Series CONF-740921, 382–390.