Map shows area explored by Lieutenant G.K. Warren known as Nebraska at the time, west from Iowa to the Rocky Mountains and north to the international border. Includes explanation of colours [although map is not in color]. Inset: "Geological & barometrical section along the Missouri River from Ft. Benton to the Platte River [crosssection]." Relief shown by hachures and by profile. Scale [ca. 1:6,000,000].

Map shows areas of military posts, trading posts, settlements, Native American habitation, and physical features in Nebraska Territory, Dakota Territory, Minnesota, and northern portions of Kansas. Includes notes and routes of explorers or survey parties. Relief shown by hachures and spot heights. Scale [ca. 1:1,200,000].

Map shows the area west of Iowa to the Rocky Mountains and north to the international border (Nebraska Territory) explored by Lieutenant G.K. Warren during the mid-nineteenth century. Dash lines indicate areas which "should be examined." Relief shown by hachures. Scale [1:6,000,000].

Map shows township grid, counties, Native American reserves and villages, military posts, towns, roads, and notable physical features. Includes references. Scale [ca. 1:506,880].

Map shows areas of military posts, trading posts, settlements, Native American habitation, and physical features in Nebraska Territory, Dakota Territory, and Minnesota. Includes notes and routes of explorers or survey parties. Relief shown by hachures and spot heights. Scale [1:1,200,000].

Map shows areas of military posts, trading posts, settlements, Native American habitation, and physical features in Nebraska Territory, Dakota Territory, and Minnesota. Includes notes and routes of explorers or survey parties. Relief shown by hachures and spot heights. Scale [1:1,200,000].