Environmental Studies in 1953

The Odonata of Canada and Alaska: Volume One, Part I: General, Part II: The Zygoptera-Damselflies by Walker, Edmund

Climatic Change: Evidence, Causes, and Effects by

Fundamentals of Limnology by Ruttner, Franz

Forest Regeneration in Ontario: Based on a Review of Surveys Conducted in the Province During the Period 1918-1951 by Hosie, R. C., Research Council of Ontario