Book appraising is a very specialized profession requiring expertise.
Until she looked up and saw Xander's appraising gaze move over her.
On the other hand, if you purchase the item from a merchant or other sports enthusiast, and the price is pretty steep, you should have the item appraised by someone who is well known in the appraising field.
There are many factors to consider when appraising antique books.
Often it is possible for you to determine the value of your antique books by appraising them yourself.