I made an interesting discovery a few years ago, finding out that Devereux Emmet laid-out a course near Windsor, Ontario, directly across the river from Detroit, for Beach Grove Golf & Country Club.
Beach Grove, not a very good course at all, has long been considered a Stanley Thompson design. A few years ago, the club hired a Canadian architect, Bob Kains, to "restore" Thompson features (which never really were there to begin with) to the course.
Anyway, I was talking to the superintendent about the "restoration" just before the work started. He gavve me a book with some old photos of the course in it, and some excerpts from early Board minutes that cleary state the course was laid-out by "Devereux Emmett of New York." The Toronto-based firm of Thompson, Cumming & Thompson (which was Stanley, his brother Nicol and Toronto Golf Club professional Geo. Cumming) supervised the construction.
I guess that years later, when the club became interested in who designed the Beach Grove course, someone looked through the minute books and didn't recognize the name Devereux Emmet. Who ever it was did recognize Thompson's name though, and Beach Grove was pronounced a Thompson design!
This story makes me wonder how Emmet ever got hooked up with guys in the Windsor area? He didn't lay out any other courses in Michigan, I don't think.