- water pollution causes, effects and control ; papers presented at the "Save the Lakes symposium", August 18-19, 1969, Detroit Lakes, Minnesota Symposium on Save the Lakes (1969 : Detroit Lakes, Minnesota) creator Minnesota University. Water Resources Research Center text Minneapolis, Minn Water Resources Research Center 1970 monographic

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61 p. PB 196 479 Water Pollution Congresses Detroit Lakes, Minnesota 20260818145052.0