English
v, 32 p. : 28 cm · Abstract also in French · "Catalogue no. CW69-5/246 E"--T.p. verso · Includes bibliographical references
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Food chains (Ecology) -- Canada · Water -- Pollution -- Canada · Acid rain -- Canada · Wildlife conservation -- Canada · Aquatic ecology -- Canada · Long Range Transport of Air Pollutants (LRTAP) Program