Strangest of All
New York: Ace Books, Inc, 1962. Second Edition. Paperback. Ace Book no. K-144. More
New York: Ace Books, Inc, 1962. Second Edition. Paperback. Ace Book no. K-144. More
London: Macmillan Children's Books, 2004. Paperback. More
New York: Ace Books, Inc, 1947. Reprint. Paperback. Original Title: "Forgotten Mysteries" Ace book no. K-255. More