A unusual triangulation chart of the <b><a href="//commons.wikimedia.org/wiki/Category:Delaware_Bay" title="Category:Delaware Bay">Delaware Bay</a></b> — from the scarce 1848 edition of the Superintendent's Report, of the United States Coast Survey.  
<ul><li>Covers from Cape May and Cape Henlopen northwards along the <b><a href="//commons.wikimedia.org/wiki/Category:Delaware_River" title="Category:Delaware River">Delaware River</a></b> past Wilmington and Philadelphia as far as Trenton.  Shows the placement of various buoys established by the Coast Survey to channel shipping in the bay and river.</li>
<li>The 1848 edition of the Superintendent's  Report  is highly unusual in that its maps do not have borders, was common in all subsequent editions.</li></ul>
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<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>
1848 (dated)
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