This volume is the first of an Atlas with large maps (mostly 12 in. x 11 in.) showing the natural distribution or range of the native tree species of continental United States including Alaska. The project is to be completed in a few volumes over a period of several years. Maps show clearly and graphically where the trees grow wild better than written summaries and have many obvious uses. These distribution maps are available to foresters, botanists, and all others interested in trees for use without restriction, since U.S. Government publications are not copyrighted. Users will render a service toward the improvement of the maps by reporting errors and range extensions. Review and correction is desired for a later, revised edition. The ultimate aim is to produce a set of highly accurate maps of wide acceptance. Volume 1 contains maps of 200 native tree species, all native conifers or softwoods, including the needleleaf evergreens (94 species, also 2 shrub species) and the important hardwoods (106 species). Almost all trees commercially important for lumber at present are included. Completing the volume are about 10 additional hardwoods useful for other products or common in the forests. Maps of 142 species in volume 1 have appeared in two recent Forest Service publications. "Silvics of Forest Trees of the United States" (Fowells 1965) has maps of 124 species prepared by the author of this Atlas. "Geographic Distribution of the Pines of the World" (Critchfield and Little 1966) has maps in color of all 36 native species of pine (Pinus), including 18 not in the preceding reference. These maps, some slightly revised, have been used, along with those of 58 additional species. Incidentally, some maps of the same species are larger and more detailed here. The order of the List of Maps is alphabetical by scientific name; first are the conifers and second the hardwoods. Thus, a map can be found quickly by scientific name without reference to list or index. Also, related species in the same genus are placed together. Each species has a separate map, many also a second or third map as needed. The method of numbering consists of a number for each species followed by a letter for the base map: W (Western United States), E (Eastern United States), N (North America). If a species has two maps, they are on facing pages. If three, the map of North America precedes or follows the double-page divided map of the United States. To avoid separating maps of a species, minor exceptions to alphabetical order were necessary, as noted under List of Maps. Common names and scientific names follow the Forest Service Check List (Little 1953). That reference contains other common names in use (“Index of Common Names,” p. 451This volume is the first of an Atlas with large maps (mostly 12 in. x 11 in.) showing the natural distribution or range of the native tree species of continental United States including Alaska. The project is to be completed in a few volumes over a period of several years. Maps show clearly and graphically where the trees grow wild better than written summaries and have many obvious uses. These distribution maps are available to foresters, botanists, and all others interested in trees for use without restriction, since U.S. Government publications are not copyrighted. Users will render a service toward the improvement of the maps by reporting errors and range extensions. Review and correction is desired for a later, revised edition. The ultimate aim is to produce a set of highly accurate maps of wide acceptance. Volume 1 contains maps of 200 native tree species, all native conifers or softwoods, including the needleleaf evergreens (94 species, also 2 shrub species) and the important hardwoods (106 species). Almost all trees commercially important for lumber at present are included. Completing the volume are about 10 additional hardwoods useful for other products or common in the forests. Maps of 142 species in volume 1 have appeared in two recent Forest Service publications. "Silvics of Forest Trees of the United States" (Fowells 1965) has maps of 124 species prepared by the author of this Atlas. "Geographic Distribution of the Pines of the World" (Critchfield and Little 1966) has maps in color of all 36 native species of pine (Pinus), including 18 not in the preceding reference. These maps, some slightly revised, have been used, along with those of 58 additional species. Incidentally, some maps of the same species are larger and more detailed here. The order of the List of Maps is alphabetical by scientific name; first are the conifers and second the hardwoods. Thus, a map can be found quickly by scientific name without reference to list or index. Also, related species in the same genus are placed together. Each species has a separate map, many also a second or third map as needed. The method of numbering consists of a number for each species followed by a letter for the base map: W (Western United States), E (Eastern United States), N (North America). If a species has two maps, they are on facing pages. If three, the map of North America precedes or follows the double-page divided map of the United States. To avoid separating maps of a species, minor exceptions to alphabetical order were necessary, as noted under List of Maps. Common names and scientific names follow the Forest Service Check List (Little 1953). That reference contains other common names in use (“Index of Common Names,” p. 451