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By "Westlake, G. F. "
The acute toxicity of industrial effluents to Daphnia magna : summary of 1987 testing / report prepared by D.G. Poirier and G.F. Westlake.
By: Poirier, D. G. - Westlake, G. F.
Publication info: [Toronto, Ont.] :Environment Ontario,c1991.
Holding Institution: Ontario Ministry of the Environment (archive.org)