A Barnstormer in Oz
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A Barnstormer in Oz is a 1982 novel by Philip José Farmer and is based on the setting and characters of L. Frank Baum's The Wonderful Wizard of Oz.
The central character of the novel is Hank Stover, a pilot and the supposed son of Dorothy Gale, who finds himself in Oz when his plane gets lost in a green cloud over Kansas in 1927. The Oz he discovers is on the brink of civil war.