What is the best way to remove a photo glued to paper?

[toyman55]

Years ago a friend of mine who worked at universal back in the Valentino days gave me an album of photos of the Son Of Shiek. He glued them to a paper and I would like to free it so I can sell them. Anyone have any ideas, also the photographer on these photos was a man named Nealson Smith who it appears did a lot of work as the photographer for the studios. Anyone ever hear of him?
thanks in advance.