Thick Paper Edition.
Detailed separate U.S. Coast Survey map of Huntington Bay and Huntington Harbor on the north short of Long Island opening onto Long Island Sound.
The map is wonderfully detailed and shows interior landcover in pictorial detail (down to the farmstead, trees, topography, etc.) at a level uncommon in most nautical charts.
Depth soundings and notes on the nature of the underwater ground are recorded as well.
This map was from the Coast Survey Harbor Map series. The map is scarce.