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  1. Framework for evaluating response of aquatic toxicity and fish habitat to water quality control in the Don River : supporting document #2 - strategy for improvement of Don River water quality / report prepared by Beak Consultants Limited and Paul Theil Associates Ltd.
    By: Beak Consultants. - Ontario. - Paul Theil Associates - Toronto Area Watershed Management Strategy Steering Committee (Ont.)
    Publication info: [Toronto, Ont.] :Environment Ontario,1991.
    Contributed by: Ontario Ministry of the Environment (archive.org)
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  2. Ontario hardwood decline survey, 1989 and 1990 / report prepared for Phytotoxicology Section, Air Resources Branch, Ontario Ministry of Environment and Energy ; report prepared by BEAK Consultants.
    By: Beak Consultants. - Ontario.
    Publication info: Brampton, Ont. :The Section,1993.
    Contributed by: Ontario Ministry of the Environment (archive.org)
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