ACTION COMICS (1938) #3

Superman investigates a possible conspiracy behind a mine collapse that may be deeper than the mine itself. The Blakely Mine Disaster (Superman) Murder at the Blue Bird Dance Palace (Scoop Scanlon) Wins a Doubleheader (Pep Morgan) Shifty Simpson Adventures of Marco Polo Sports at Sea (full text story) The Sealed City pt 2 (Tex Thomson) Chuck Dawson Death from the Air (Zatara) Here and There