Everything you need to understand or teach The Marvelous Land of Oz by L. Frank Baum.
Though there are a number of thematic elements in the social concerns discussed above, certain themes per se may be found in Baum's second Ozian adventure story: 1) breaking down boundaries and barriers; 2) establishing legitimacy of rule; and 3) the use of air power in escape and pursuit, and in warfare. As to the first, animals (even an insect) and hand-made figures are seen participating actively, almost on equal terms, with humans, in human concerns...