Northern Plains / produced by the Cartographic Division, National Geographic Society ... ; John B. Garver, Jr., chief cartographer ; John F. Shupe, associate chief.National Geographic Society (U.S.). Cartographic Division1986"Supplement to the National Geographic, December 1986, page 786A, vol. 170, no. 6."Includes historical notes and key to abbreviations.Panel title: The making of America, Northern Plains.Relief shown by shading and spot heights.Text, col. ill., and 5 mcartographic