Keywords: JNN-1843-Map.jpg LargeImage en 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 Lieut J C Fremont of the Corps of Topographical Engineers under the superintendence of the Bureau of the Corps of Topographical Engineers and authorized by the War Department U S Congress creator Joseph Nicollet 1843-01-01 From Library of Congress map collection http //lcweb2 loc gov/ammem/gmdhtml/dsxphome html PD-USGov Joseph Nicollet Old maps of the Mississippi River |