Are you still looking for information re: William Henry (Bill) Prevo?
I have been researching the Arnold/Jacobs family (Alva Bert Arnold/Altha Mabel Jacobs) and recently started restoring a photo album that my G-grandmother Mabel passed on to her oldest daughter, my grandmother, Zula Arnold Anderson.
There are a few photos of Bill and his family. I was told that 16 year old Bill Prevo visited his uncle Bert at his homestead in the Upper No Wood area and then settled in or near Ten Sleep, later moving to Casper and later to the Manderson area. He is buried in the Ten Sleep Cemetery.
I also have (too few) photos of the extended Arnold families taken 7/25/1925 - they are in pretty good shape for being 85+ years old. I'd be happy to share.