Help with old photos please
 

I bought some beautiful original photos of the 1923 University of Maine football team, and 1924 University of Maine hockey team. I believe that the hockey photo is the last known photo of a Maine hockey team until they joined NCAA Division I in 1976.

The problem is that they are glued to a piece of paper back-to-back. I would love to separate them, but I have no idea how to do that, and of course, I am afraid I might damage or destroy them trying.

Does anyone know how to do this?

Thanks,
Sean