From Beyond the Unknown #10

The Fish-Men of Earth! The Devil's Island of Space! "It takes 25,000 pounds of water..." The Most Dangerous Man on Earth!  Destination - Star "Although not apparent to the naked eye..." Tomorrow's Hero! The 24,000-Hour Day! "Amalthea -- Closest of Jupiter's satellites..."  The Answer Man of Space! "The elevation above which mountains are covered with perpetual snow..." Reprints from: Strange Adventures (DC, 1950 series) #56, Mystery in Space (DC, 1951 series) #46, The Flash (DC, 1959 series) #146, Strange Adventures (DC, 1950 series) #129, Mystery in Space (DC, 1951 series) #14, Justice League of America (DC, 1960 series) #29, Strange Adventures (DC, 1950 series) #112, Mystery in Space (DC, 1951 series) #49, Green Lantern (DC, 1960 series) #31 which is reprinted from Showcase (DC, 1956 series) #18, Mystery in Space (DC, 1951 series) #73, and Hawkman (DC, 1964 series) #3.