Scale ca. 1:1,000,000. Relief shown by shading and spot heights. "51280." Includes location map. Available also through the Library of Congress Web site as a raster image. AACR2
United States. Central Intelligence Agency
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/75695011/">https://www.loc.gov/item/75695011/</a>