Sketch Showing the Progress of the Survey in Section X (Middle Sheet). Coast of California from Point Sal to Tomales Bay

A very nice map showing the progress of the triangulation and survey along the California coast from Point Sal to Tomales Bay, including all of the Farallon Islands, San Francisco Bay, and a few inland triangulation stations. The coastline is highly detailed with many place names and some rivers shown. This is the middle sheet of the set.

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.