page inside a 1949 copy of Forest Spraying and Some Effects of DDT – published by Department of Lands and Forests – Ontario Canada

page inside a 1949 copy of Forest Spraying and Some Effects of DDT - published by Department of Lands and Forests - Ontario Canada

page inside a 1949 copy of Forest Spraying and Some Effects of DDT – published by Department of Lands and Forests – Ontario Canada

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