I'm looking for the parents of Henry Simmons who died in Friendship, ME, 1854, age 40. He married Sarah Poland in 1836. I believe he may be mentioned in "Genealogy of the Simmons family of Maine and Massachusetts" by Frederick Simmons, publ. 1920. I understand a copy of this book is held at the Maine State Library.
Yes, I'm aware of the online family trees that state his parents were Isaac Simmons & Elizabeth Thompson. But to my knowledge none of them provides any evidence for this assertion.
P.S. I've not found any birth records in the FHL catalog, but you might have more luck. I've searched an index of land records where I did see a transaction where Henry was a grantee of land bought from grantor William Simmons (there could be other records, this index is poorly organized). William may have been a brother of Henry, as it appears Henry's son Henry (Jr.?) lived with William after the elder Henry's death. I also reviewed the pension record of Isaac Simmons and widow Elizabeth, but found no mention of Henry.