Robert Wilcox’s third edition of Japan’s Secret War has been updated and expanded with even more sources and information on Japan’s attempt to build an atomic bomb during WWII. This new edition is gaining just as many commendations as when it was first released!
https://www.asiatimes.com/2019/12/article/japans-secret-war-and-the-atomic-bomb/
Japan’s Secret War is available now wherever books are sold! http://permuted.to/168261896X