Southwestern United States / compiled and drawn in the Cartographic Section of the National Geographic Society ; James M. Darley, chief cartographer ; compilation by H.C. Bryan, R.W. Collins, R.J. Darley, A.D. Grazzini, and A.E. Holdstock ; relief by JohnNational Geographic Society (U.S.). Cartographic Section1948Issued with National Geographic magazine, v. XCIV, no. 6, December, 1948.Relief shown by shading and spot heights.cartographic