Inherited Collection From Grandfather

joe4vt I am in agreement with what has been said. I might make one exception. If the full sheets are in fact older issues of less common stamps, those may have some monetary value at more than face value BUT they really do have to be desirable to stamp collectors. Why not take a photo or two of the ones that appear to be the oldest to you. We would only need a scan of one stamp and not the entire sheet to identify it. If you cannot do that, give a detailed description such as value, color, size, any words that are printed on the stamp, etc. This might help you decide what to do. I would recommend your taking up collecting as it is a satisfying hobby and has potential to decrease the stress of studying.