This is an attractive 1877 U.S. Coast Survey triangulation chart or nautical map of Long Island, New York.  Covers from Staten Island and New York City eastward along Long Island and the coast of Connecticut to Block Island and Point  Judith.
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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>
1877 (dated)
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