Sketch G Showing the Progress of the Survey in Section No. 7. U.S. Coast Survey in the Year 1849 Reconnoissance of Pensacola and Perdido Bays and plan of Triangulation

A progress and triangulation chart of Bon Secour Bay on the west, centering on Perdido Bay and Pensacola Bay and Santa Rosa Sound and Island on the east. Shows Black Water and Yellow Water rivers. No soundings.

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.