Sketch A Showing the Progress of the Survey in Section No. I From 1852 to 1865

A nice chart of the Northeast Coast of The United States showing the progress of the Survey. This is a chart of the area showing fine coastline detail and triangulation points and stations. The chart includes an inset showing detail of the rocks off Portland Harbor. 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.