The World.
United States.Army Map Service.
Washington : Army Map Service, Corps of Engineers,
1959-
Relief shown by contours, gradient tints, shading and spot heights.
Various editions.
Earlier eds. titled: The World less polar regions.
Sheet 4 includes inset of "North polar region" at 1:20,000,000.
Sheet 6 includes inset of "South polar region" at 1:20,000,000.