Gilberton · February, 1961
Undersea Adventures
The Frogmen; Mines Below; Underwater Conquest; Sea Monsters—False and True; Sunken Treasure; Skin Diving; In Magellan’s Wake; Seven Miles Down; The Duel (text); D-Day Part 4; Night Drop; The Red Planet Part 4; A Trip to Mars; The World of Science: Blue Skies