I am happy to report that several people have replied to my queries and I now know that this David is buried in Woodside Cemetery and I photographed his grave years ago not knowing that he was the father of Hartwell Dunham, who was half-brother to Seneca Dunham. This solves my Dunham Puzzle. Albert Seneca Dunham was the son of Seneca Dunham, grandson of Revolutionary War Patriot Edward Dunham. Amelia was the daughter of Hartwell Dunham. Albert and Amelia married 25 Dec 1865 in Plainwell, Allegan Co., MI and they were first cousins, once removed. I am grateful to everyone who replied to my queries. Thank you.