Sketch J. No. 10 Showing the Progress of the Survey in the Bay of San Diego California

Triangulation progress survey chart of the Bay of San Diego from the U.S. boundary line, to Point Loma and the interior of Bay of San Diego. Shows many base stations, points and astronomical 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.