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SEVEN WORLDS TO CONQUER [BACK TO THE STONE AGE] in ARGOSY [complete in six issues].
New York: The Frank A. Munsey, Company, 1937. Octavo, six issues, cover illustration for the January 9 issue by Emmett Watson, pictorial wrappers. Pulp magazine. Complete six part serial "Seven Worlds to Conquer." This first issue of the serial includes a foreword that was not included in the subsequent book publication, which was titled BACK TO THE STONE AGE. A Pellucidar adventure. Zeuscher, Edgar Rice Burroughs: The Bibliography, pp. 19-20.
DIME DETECTIVE MAGAZINE.
Chicago: Popular Publications, Inc., 1934. Octavo, single issue, cover by John Howitt, pictorial wrappers. Pulp magazine. Cook, Mystery, Detective and Espionage Magazine, pp. 168-170.
DIME DETECTIVE MAGAZINE.
Chicago: Popular Publications, Inc., 1934. Octavo, single issue, cover by John Howitt, pictorial wrappers. Pulp magazine. Fiction by Carroll John Daly, George Harmon Coxe and others. Cook, Mystery, Detective and Espionage Magazine, pp. 168-170.