. The Canadian field-naturalist. 1987 Pesant: Snowmobiling Impact on Snow and Soil and Crops 25 20- uj 0 CC3 < -10 =! bJ -20- -30 LA POCATIERE 1973-74. I- ^^ o 60 40 20 0 20 40- ea- GROUND LEVEL -\ r -1 1 r. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club

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