Here is a picture of our camp at what appears to be just after the build, which was 1985 or 1987.
(I can never remember the date between our house and the camp.)
With a little detective work and time, you can search surnames in
www.nhdeeds.com and read the deeds for the land descriptions.
It takes time, but you can trace each lot (if you have a name to go by) back to about 1841. A great winter project.
Before 1841 you must have to physically go to the Registry of Deeds.
Joseph I. Melanson purchased the island in 1950: Book 320, Page 439