1. Alkaline snowfalls in Ottawa and Winnipeg, Canada;Allan;Atmos. Environ.,1978
2. Some measurements of air quality and precipitation in Saint John, N. B;Anlauf;Water, Air, Soil Pollut.,1976
3. Bond, R. T., and Straub, C. P., eds. “Handbook of Environmental Control, Vol. I: Air Pollution.” CRC Press, The Chemical Rubber Co., Cleveland, Ohio.
4. Nutrient loss accelerated by clear-cutting of a forest ecosystem;Bormann;Science,1968
5. Nitrogen: sources and transformations in natural waters;Brezonik,1972