During my last booking adventure, I purchased two works that had previous owner signatures. These markings seriously degrade the value of the works that they mar. First edition/First printings of The Wonder Boys as published by Villard range in value from 25.00 to 45.00s depending on condition. One marred by a previous owner's signature would only be valued in the 15.00 range. Upon doing some research, one way that is suggested to remove such signature is lite sanding with a very fine sandpaper. I purchased a 400 grade sandpaper for this purpose. Using a very small square of paper, softly sand the area being very careful not to take too much paper. It is possible to sand through the page. Working carefully, your results can be nearly indetectable as this sanded page shows.