The NW section of the chart of Boston Harbor, Mass. Showing note on
"Triangulation was executed in 1846&47. Topography & Hydrography were done in
1846, 60&64. Symbols of "Sunk Rock", "Rock Awash", "Ledge of Rocks", "Position
of Life Boat", and "Hut of Refuge." Humane Society established "Hut of Refuge."
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