Kathy Martin and myself have done a bunch of research on John Harvell. Us Robbinston Harvells are starting to be heard from. Actually, the last family moved from Robbinston in 1975, but the home is still there.
Almon was born in 1795, not 1814, and probably born in E Madison ME, as opposed to Amherst NH. The John Harvell family removed from E Madison ME to Robbinston ME in 1814. Family has recently discovered that Almon had a first wife, Anne (no issue), before Delena. That is why the late marriage.