1. Some Effects of Crop-Production Technology on Environmental Quality
2. Acidification of the La Cloche Mountain Lakes, Ontario, and Resulting Fish Mortalities
3. Biggar, J. W., and R. B. Corey. 1969. Agri-cultural drainage and eutrophication. Pages404-445 in Eutrophication: Causes, Con-sequences, Correctives. Nat. Acad. Sci./Nat.Res. Council, Publ. 1700. Washington, D.C.BiggarAgricultural drainage and eutrophication404Eutrophication: Causes, Consequences, Correctives1969