Indicia states "1st edition" rather than an issue number. On sale date as listed in the Catalog of Copyright Entries, Periodicals, July-December 1950, page 157, registration number B271755.
Tim Dover; Dan Dover; Jose; Professor Archibald Monks; Carol Monks
Synopsis
Tim and Dan meet a professor and his daughter in the Jungle. They join forces and the daughter is kidnapped by Indians and prepared to be sacrificed to a volcano.