I'm a descendant of Alanson Earl, too; my father's mother is Anna Mabelle Manning, her mother is Elizabeth Earl -- your ancestor Wilbur J.'s sister.
So that makes us --- third cousins once removed???
My brother-in-law, the family genealogist, has a photo of Alanson at http://www.newenglandballproject.com/g2/p2786.htmhttp://www.newenglandballproject.com/g2/p2786.htm (seach for "Alanson" and you'll get there).He's usually very particular, but, I don't know where this photo comes from, and if it is of Alanson, its *very* early as photographs go.(I wonder if it isn't actually a photo of George Alanson?One of these days I'll have to ask.)
I did a lot of digging online about the ancestors of Alanson's wife Dorcas Tabitha Wixon... happy to share that with you!