How Guns were Invented How Guns were made to Shoot Straight Guns that Fire One Thousand Shots per Minute Giant Guns What is an Explosive? How Shells were Invented How We Came to Make Iron Ships Ships that Go Under the Sea Some Questions about Submarines The Deadly Torpedo How Torpedoes and Mines are Exploded A Very Dangerous Occupation The Eye of the Submarine Measuring the Distance to the Enemy Ships that Go Up in the Air War in the Air
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