Scale ca. 1:18,000,000. Depths shown by gradient tints. "502262." Available also through the Library of Congress Web site as a raster image. AACR2
United States. Central Intelligence Agency
1974
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/76695260/">https://www.loc.gov/item/76695260/</a>