Illustration from L. Frank Baum’s The Wonderful Wizard of Oz. The first of a fourteen-volume series, it remains the most popular of the Oz books — not least of all because it’s the only one illustrated by W. W. Denslow, whose depictions of Dorothy, Toto, and all the other creatures and landscapes of Oz have become so iconic as to be inseparable from Baum’s story. (Source: Library of Congress)