compiled and drawn in the Cartographic Section of the National Geographic Society for the National Geographic Magazine ; James M. Darley, chief cartographer
Scale 1:2,500,000. 39.46 mi. to the in., Albers conical equal-area proj., standard parallels 28⁰ and
(W 108⁰--W 88⁰/N 38
Relief shown by shading and spot heights.
This is the fifth in a series of sectional maps designed to cover the United States on the uniform scale of 39.5 miles to the inch, excepting the Northeastern United States which is 27.6 miles to the inch.
Issued with the National Geographic magazine, v. XCII, no. 6, December 1947.