Tracing of the original map showing the Grignon claim at Portage
1 : 31680 This map is pencil on tracing paper and shows marshes, the Wisconsin River, Indian trails, and Indian boundary line. The upper left corner reads: "Let sections 2, 3, 4, 9 in township no. 12 N. in range no. 9 East, and sections 33, 34 35 in Township 13 N. Range 9 East, be reserved for military purposes. (signed) Andrew Jackson."
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
A Geological Map of Wisconsin
1 : 1710720 This map shows counties, cities, rivers, canals, lakes, railroads, common roads, county towns, townships, villages, and post offices. The map includes part of the upper peninsula of Michigan. Lapham, Increase Allen