A New Species of Heteromiid Rodent from the Middle Oligocene of Northeastern Colorado, with Notes on the Skull, by Edwin S. Galbreath (Edwin Carter Galbreath) is a landmark work on the discovery of a new species of rodent. In this book, the author reveals important aspects regarding the genus of heteromyid rodents, examines their skulls, and provides important conclusions about the evolution of this group of animals. Thanks to a detailed analysis of fossils and accurate observations, the author makes a significant contribution to the study of the ancient fauna of the Middle Oligocene period and the development of rodents in this time period. The book is not only an example of highly professional research, but also an integral part of paleontological literature, which helps to discover and reveal the secrets of the past of our planet.