"Geographic Variation in the Pocket Gopher, Thomomys bottae, in Colorado" by Phillip M. Youngman is a scientific publication produced in the mid-20th century. This work primarily focuses on the study of the geographic distribution and variation of the pocket gopher species Thomomys bottae within Colorado. The text offers insights into the different subspecies and their specifics based on ecological zones, physical characteristics, and local adaptations. The book examines 249 specimens of Thomomys bottae, identifying six distinct subspecies present in Colorado, each adapted to their unique environmental contexts. Youngman's research details the physical characteristics that distinguish these subspecies—such as coloration, skull shape, and anatomical features—while also emphasizing the importance of geographic factors. The study provides a comprehensive overview of the habitat preferences of the species and subspecies in relation to Colorado's diverse landscapes, including the Colorado Plateau Province and Southern Rocky Mountain Province. (This is an automatically generated summary.)