Victor Appleton 
Tom Swift Omnibus #8: Tom Swift and His Air Scout, Tom Swift and His Undersea Search, Tom Swift Among the Fire Fighters, Tom Swift and His Electric Locomotive [EPUB ebook] 

Tom Swift Omnibus #8 contains a quartet of stories: In the twenty-second of Victor Appleton’s original Tom Swift novels, Tom hits upon the idea of a silent airplane engine, and continues his war effort focus. In the twenty-third of Victor Appleton’s original Tom Swift novels, Tom once again searches for sunken treasure while aboard his submarine. In the twenty-fourth of Victor Appleton’s original Tom Swift novels, Tom employs his aerial fire suppression system to rescue his friends. In the twenty-fifth of Victor Appleton’s original Tom Swift novels, Tom is employed to design and build an an electric locomotive with exacting specifications, but competitive forces introduce both crime and crisis.