The book "Through the Mackenzie Valley. A Narrative of the Athabasca and Afternoon River Treaty Expedition in 1899" was written by Charles Meyer. In this book, the author travels along the Athabasca River and the Afternoon River in 1899, describing the adventures and impressions of this expedition. Through his eyes, we see the rich fauna and flora of the Canadian West, and also meet with local residents and even negotiate a contract. This book is a fascinating narrative about an important journey in the distant year 1899, which reveals to us the beauty and majesty of the nature of the northwestern part of Canada.