Victor Appleton 
Tom Swift Omnibus #7: Tom Swift and His Big Tunnel, Tom Swift in the Land of Wonders, Tom Swift and His War Tank [EPUB ebook] 

Tom Swift Omnibus #7 contains a trio of stories: In the nineteenth of Victor Appleton’s original Tom Swift novels, Tom lends a hand to a Peruvian construction project, and develops a new blasting powder. In the twentieth of Victor Appleton’s original Tom Swift novels, Tom goes on a Honduran treasure hunt, in search of a mysterious golden idol. In the twenty-first of Victor Appleton’s original Tom Swift novels, Tom asks for military exemption to focus on the scientific side of the war effort.