This copy is a proof before publication with two autograph revisions by Warren and his signed annotation, "Proof sheet from an unfinished engraving | Feb. 22. 1858 | G. K. Warren | Sr. Top Engr." In one revision, Warren has deleted the names of Indian peoples believed to be present in the Colorado and Green rivers area of the Southwest and instead marked that area "unexplored." In the other, he has extended the Salmon River southward.
The second map is an early precursor to Warren's great map, described by him in a Note appearing under the title as "a hurried compilation of all the authentic surveys and is designed to exhibit the relations of the different routes to each other; the topography represents only those great divides which form summits on the profiles of the routes."
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