You might want to keep it for when you are in practice. A set of Campbell's, even an old set can be helpful to you so you don't have to go dragging a volume around. For example leave your old copy at your dictation desk in the OR. So when you unexpectedly have to do a BKA or something else, you have an available reference. Also, having an extra copy of Hopenfeld's exposures in the OR is handy, especially when doing unexpected upper extremity trauma.