. The Canadian field-naturalist. Natural history. Total Number of Waterfowl. IP/100 ton â¡ 0-5 â¡ 5-10 â 10-20 IP/100 ton D 25-50 50-100 100-200 200-400 Figure 2. Contoured maps showing breeding densities of individual waterfowl species, overall breeding density, and species richness. 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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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky