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Jack Snow
John Frederick Snow, born Piqua, Ohio was an American radio writer, writer of ghost stories, and scholar, primarily of the works of L. Frank Baum. When Baum died in 1919, the twelve-year-old Snow offered to be the next Royal Historian of Oz, but was turned down by a staffer at Baum's publisher, Reilly & Lee. 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 guide to the Oz characters, all of which Reilly & Lee published.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

The Magical Mimics in Oz
1991
ISBN 9780929605098
Magical Mimics in Oz
2021
ISBN 9798545098293