Territory of the United States from the Mississippi River to the Pacific Ocean; originally prepared to accompany the reports of the explorations for a Pacific Railroad route (Copy 1, Sheet 3)
Relief shown by hachures and spot heights. "Railroads corrected June 5th 1873." Shows routes and dates of expeditions and surveys. Includes list of "Authorities" and inset "Territory of Alaska." Historic Maps copies 1 and 2 on 4 sheets. Historic Maps copy 3 imperfect: sheets 3 and 4 wanting.