What is the value of 1920 edition book by L Frank Baum if cover has illustrator John R name misspelled as Jno Neill?

If an original edition of L. Frank Baum's book from 1920 had a spelling mistake on the cover, such as "Jno Neill" instead of "John R. Neill," it can potentially impact its value among collectors.

In general, rare books and other collectibles increase in value due to scarcity and significance over time.

Books, like The Wonderful Wizard of Oz by Baum, tend to have several print versions or editions produced throughout the years. While a misprint isn't typical for an authorized publication.