Hidden World By Coblentz, Staton A. Books / Paperback Special Collections / Author Archives › D. Douglas Fratz Collection Publisher: Airmont, January 1964 Price $7.30 Free Shipping Send to a friend Collectible - Very Good Collectible - Very Good. Mass Market Paperback edition. From the library of science fiction and fantasy writer, editor, publisher and prolific book reviewer D. Douglas Fratz. (Science Fiction, Fantasy) $7.30 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.