Inside front cover.
Also in Green Lantern (DC, 1941 series) #15.
Also in All-American Comics (DC, 1939 series) #65.
Also in Mutt & Jeff (DC, 1939 series) #17.
Also in Mutt & Jeff (DC, 1939 series) #7.
Also in All-American Comics (DC, 1939 series) #79.