The book "Mammal Records of Hogebeek and Ontonagon Counties, Michigan, 1920. One-off Publications of the Museum of Zoology, Number 109" reveals important aspects of faunistics and naturalistic research conducted in northwestern Michigan in the early 20th century. The authors, Lee Raymond Dice and Harley Bakewell Sherman, describe in detail the species of mammals living in these counties, consider their ecology and distribution. The publication includes research results, classification data, as well as observations of the behavior of mammals in the wild. This book will be a valuable source of information for scientists, students, and anyone interested in the nature and biodiversity of western Michigan.