In 1943 Hart, now recognised as preeminent in the field of tubercular Roentgenology, compiled his extensive evidence on TB and other x-ray-detectable cases into a definitive compendium, These Mysterious Rays: A Nontechnical Discussion of the Uses of X-rays and Radium, Chiefly in Medicine (pub. Harper & Brothers), still a standard text today. The book was translated into several languages, including Spanish.
