Hydrographical Basin of the Upper Mississippi River : From Astronomical and Barometrical Observations Surveys and Information : by J.N. Nicollet, in the years 1836, 37, 38, 39, and 40 ; assisted in 1838,39, & 40, by Leiut. J.C. Fremont ... Reduced and compiled under the direction of Col. J.J. Abert ... by Lieut. W.H. Emory from the map published in 1842 and from other authorities in 1843. Published by order of the U.S. House of Representatives. C.B. Graham's Lithy.

This map is the earliest accurate mapping of the region of the Northern Plains and Upper Mississippi River. Lithographed by C. B. Graham. Extends from St. Louis north to the Canadian Border, and west along the Missouri River. Printed on two sheets, joined. The map is based upon a series of systematic instrument surveys conducted by Nicollet, assisted by Lt. John Charles Fremont, of the Army Corps of Topographical Engineer. His map was years ahead of its time, with its regional concept and sound basis in instrument readings and astronomically determined points. Had he lived longer, Nicollet would undoubtedly have become the official government cartographer of the whole trans-Mississippi West. This copy is the House of Reprentatives issue. See our 2488.000 for the Senate issued, which appears identical except for the lithographer.