Map of the United States to the Rocky Mountains, with inset "Map of Oregon, California, &c." Wheat remarks that "Doggett's Rail Road Guide map of the United States with 'The working lines of Railroad' shown in color (an mighty few they were), was published in 1847 with a small insert 'Map of Oregon, California &c.' It generally follows Fremont's geography, but calls Lake Tahoe 'L. Fremont,' while New Helvetia is the only placename in California's interior. Though small, this was an accurate map for its time, and shows that some geographers were taking advantage of the recent explorations." The map is still attached to the gutter of the title-page of the Guide in which it was issued, but none of the text is present. Wheat Transmississippi 541.