Value of a 1940 Webster's Dictionary?

I have a 1940 edition of Webster's Wonder Word Book Self-Pronouncing Dictionary. It was printed in 1940 by the Southwestern Company. The original owner wrote his name in it and dated it August 25, 1941. My parent's house burnt to the ground 28 years ago, but the book survived with a small amount of water staining on the first few pages. It contains over 1200 illustrations, a brief history of the English language, principles of grammar, common errors in spelling and writing, dictionary of war terms, the latest official census, and so much more!