Jack Snow was an American radio writer, and scholar, who wrote the thirty-eighth book, in the series of Oz books, titled ?
Jack Snow (writer):  Snow eventually wrote two Oz books: "The Magical Mimics in Oz" (1946) and "The Shaggy Man of Oz" (1949), as well as "Who's Who in Oz" (1954), a thorough guide to the Oz characters, all of which Reilly & Lee published. The Shaggy Man of Oz: The Shaggy Man of Oz (1949) is the thirty-eighth in the series of Oz books created by L. Frank Baum and his successors, and the second and last by Jack Snow.
The Shaggy Man of Oz