Triangulation in Wisconsin
1 : 506880 This map shows names of triangulation stations, railroads, counties, rivers, and lakes. The Mississippi River, Lake Winnebago, and Lake Michigan are labeled. The upper right corner includes a key of markings. The map covers north to Eau Claire. Davies, John Eugene Wisconsin Geological Survey
[Coteau des prairies, M'dewakaton country, Warpekutey country, Winebago Indian country, Iowa Territory; middle right.] / by J.N. Nicollet, made in the years 1836, 37, 38, 39 & 40 ; assisted in 1838, 39 & 40 by Lieut. J.C. Frémont of the Corps of Topog...
From Map of the hydrographical basin of the upper Mississippi River : from astronomical and barometrical observations, surveys and information