Environmental Research Foundation . . P.O. Box 5036, Annapolis, MD 21403 . .
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To subscribe, E-mail the words . . This is the first study to show that the effects of these three factors are related. These researchers have been studying a group of lakes in northwestern Ontario, Canada, over a 20-year period from 1971 to 1990. The Canadian and Hudsonian regions of the earth are covered with boreal forests. Boreal lakes are the most numerous kind of lake on earth.