Sketch Showing the Progress of the Survey in Section XIII. Reconnaissance and Triangulation in Wisconsin

An inland geodetic triangulation of Wisconsin. Progress of the triangulation and reconnaissance are shown with many base stations and triangulation points. The Mississippi River, and Wisconsin River are shown in great detail along with various other rivers, and railroads. Also shown are place names and triangulation stations.

IMPORTANT NOTE:

All of our United States Coast Survey (USCS), United States Coast & Geodetic Survey (USC&GS), and similar maps and charts have been professionally unfolded and flattened using humidity baths, semi-permeable membrane and drying blotter techniques. Most others you typically see on eBay have not been, and worse, are quickly and crudely unfolded for the low quality photos you see. Unfolding these maps in that way is damaging and weakens them. Please be aware.