Atlas of United States Trees: Conifers and Important Hardwoods, by E.L. Little, Jr, is a comprehensive volume that maps the natural distribution of native tree species across the United States. The book is part of a series of five volumes that cover different regions and types of trees. Volume 4, Minor Eastern Hardwoods, focuses on 166 tree species native to the eastern contiguous United States. The book provides detailed maps for each species, showing their range and distribution. The maps in the book are based on a variety of sources, including publications, herbarium specimens, fieldwork, and expert consultation. The book follows a specific naming convention for both scientific and common names, with some minor changes in nomenclature included in the forthcoming revision. The book also includes base maps of the United States, North America, and the National Forest System, providing context for the distribution maps. Each species map is accompanied by a legend and additional notes, summarizing the range of the species and any outlying stations. The book does not include information on planted or introduced trees outside their natural range, focusing solely on the native distribution of tree species. Overall, Atlas of United States Trees: Conifers and Important Hardwoods provides a detailed and comprehensive overview of the natural distribution of tree species in the eastern contiguous United States. The book is a valuable resource for foresters, botanists, and anyone interested in the diverse tree species found across the country.