U.S. Coastal Survey of Somes Sound, 1871. Shows topography of surrounding land and roads in existence at that time. Road from Somesville to Southwest Harbor runs east of "Echo Lake-Demings Pond." Shows structures.
“1871 Chart of Somes Sound and adjacent land,” Mount Desert Island Historical Society, accessed November 5, 2024, https://mdihs.digitalarchive.us/items/show/11597.Item 11963