The book "A new subspecies of Microtus montanus from Montana and comments on Microtus canicaudus Miller" by Hall, E. Raymond (Eugene Raymond) and Kelson, Keith R. is an important scientific work devoted to the study of rodents of the family Cricetidae. In this book, researchers examine a newly discovered subspecies of Microtus montanus that lives in the state of Montana, revealing its features and differences from other subspecies. In addition, the authors analyze Microtus canicaudus Miller, providing valuable comments on this rodent species. This book is a valuable source of information for scientists interested in the amazing world of the animal kingdom. It contains the results of detailed studies, analyzes and observations that help to expand our knowledge of the biodiversity and evolution of rodents. The authors highlight not only the taxonomic aspects, but also the ecological role of these species in the natural environment. "A new subspecies of Microtus montanus from Montana and comments on Microtus canicaudus Miller" is an important book that opens new horizons for researchers and nature lovers, revealing the unique features and characteristics of the rodents of the North American landscape.