The Black Mask [Vol. IV No. 1, October 1921] ed. F. M. Osborne (Pro-Distributors Publishing Company, Inc., 20¢, pulp, cover by Eliot Keen)
Details taken from Table of Contents.
The Black Mask [Vol. IV No. 2, November 1921] ed. F. M. Osborne (Pro-Distributors Publishing Company, Inc., 20¢, 128pp, pulp)
Details taken from Table of Contents.