Scale not given. Accompanied by Dept. of the Interior news release: Radar probes geologic past of Yellowstone National Park. Available also through the Library of Congress Web site as a raster image. AACR2
Relief shown by contours and spot heights. "Compiled in 1967 from 1:62,000-scale maps dated 1954 and 1962 and by photogrammetric methods from aerial photographs taken 1951, 1954, 1958, and 1960." "Supersedes map dated 1923." Available also through the Library of Congress Web site as a raster image. "N3600--W11145/28/60."