This groundbreaking study of the Athabaska-Mackenzie region is a comprehensive and detailed analysis of the natural history of one of North America's most ecologically diverse regions. Edward Alexander Preble's research covers a wide range of topics, including the region's geology, plant and animal life, and climate, and offers a fascinating glimpse into the complexity and diversity of the environment. Written in a clear and accessible style, this book is an essential resource for students and researchers interested in biology, ecology, and environmental science. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.