Young book collector/dealer

My son has two miniature books (one a gift and one that he purchased) that he is bringing to the Portland Book Fair this Sunday. He is such a riot about them. He helped to catalog them and has memorized the publisher and pub. dates of each. He also said that he intends to use some of the money if either sell to buy more so he can have more for the next year. A book dealer is born (and a really cute one, at that).