Sixth annual report of the United States geological survey of the Territories, embracing portions of Montana, Idaho, Wyoming, and Utah : being a report of progress of the explorations for the year 1872
Government field report of the Hayden Survey for 1872, printed by the Government Printing Office in Washington in 1873 for Congress and working geologists mapping Montana, Idaho, Wyoming and Utah. Plates mix hachured relief maps, labelled geological section panoramas of mountain skylines, and wood-engraved landscape views of lakes, conifers and boulder foregrounds, useful for line-drawn terrain texture and annotated diagram layouts.
