May 2, 1931 issue ~ cover art by John A. Coughlin
March 1930 issue ~ cover art by Sidney Riesenberg
July 1939 issue ~ cover art by H.L. Parkhurst
July 1956 issue
December 1937 issue ~ cover art by Arthur Gross
1959 Dell reissue – cover art by Robert McGinnis
1952 Morrow hardcover
Cover art by Robert McGinnis
13th with private eyes Bertha Cool and Donald Lam
1966 20th Century Fox – artwork by Bob Peak
1966 20th Century Fox – One Sheet 27x 41″
artwork by Bob Peak
