Years ago, my mother in law gave me a set of children's books that she had read as a child, and had belonged to her dad. She gave me the books with great reverance and told me not to let the kids trash them. So, they went on the top shelf of the bookcase and were never read. 

The books are from 1922. The pages and the binding are brittle. But aren't the illustrations cool?

Oh. Wow. I guess that they are worth some money.