Sketch Showing the Progress of the Survey in Section XI (Upper Sheet). Coast of Oregon and Washington Territory from Tillamook Bay to Boundary

A gorgeous map of parts of the northwest coast and Washington Sound (Puget Sound), including islands and parts to the boundary line. The map shows the progress of the survey and triangulation from Tillamook Bay to the border with Canada. The Columbia River and vicinity as well as all of Washington Sound are highly detailed. Northwest Washington is very lightly charted.

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.