A delicately hand-colored 1859 US Costal Survey map or triangulation chart of Washington State from Tillamook Head to Vancouver Island, including Juan De Fuca Strait, the Puget Sound, Olympia, and Seattle, with numerous triangulation lines.  Produced under the supervision of A. D. Bache, one of the most influential directors of the U. S. Coast Survey.
<div class="fn value">
<a href="https://en.wikipedia.org/wiki/United_States_Coast_Survey" class="extiw" title="en:United States Coast Survey">United States Coast Survey</a></div>
1859 (dated)
This file was provided to Wikimedia Commons by <a rel="nofollow" class="external text" href="http://www.geographicus.com/">Geographicus Rare Antique Maps</a>, a specialist dealer in rare maps and other cartography of the 15th, 16th, 17th, 18th and 19th centuries, as part of a <a href="//commons.wikimedia.org/wiki/Commons:Geographicus" title="Commons:Geographicus">cooperation project</a>.