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Threats to Ecosystems - Population Variation by Ecoprovince, 1971 to 1996 / Menaces pour les écosystèmes - Variation de la
population selon l'écoprovince, 1971 à 1996; Atlas of Canada. Atlas of Canada, Reference Map Series 6376, (ed. 6), 2010, 2
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https://doi.org/10.4095/300876 
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