55 The Electric Island; or, Frank Reade, Jr.’s Search for the Greatest Wonder on Earth.
56 The Underground Sea; or, Frank Reade, Jr.’s Subterranean Cruise.
57 From Tropic to Tropic; or, Frank Reade, Jr.’s Tour With His Bicycle Car.
58 Lost In a Comet’s Tail; or, Frank Reade, Jr.’s Strange Adventure With His Air-ship.
59 Under Four Oceans; or, Frank Reade, Jr.’s Submarine Chase of a “Sea Devil.”
60 The Mysterious Mirage; or, Frank Reade, Jr.’s Desert Search for a Secret City.
61 Latitude 90 Degrees; or, Frank Reade, Jr.’s Most Wonderful Mid-Air Flight.
62 Lost In the Great Undertow; or Frank Reade, Jr.’s Submarine Cruise In the Gulf Stream.
63 Across Australia with Frank Reade, Jr.; or, In His New Electric Car.
64 Over Two Continents; or, Frank Reade, Jr.’s Long Distance Flight.