Hans Lengerer and Lars Ahlberg have coauthored books about the aircraft carrier Taihō, the armor-clad Fusō- to Kongō-class battle cruisers, and the Yamato-class battleships, the last of which was recently published. They privately publish Contributions to the History of Imperial Japanese Warships. Hans Lengerer and Lars Ahlberg have coauthored books about the aircraft carrier Taihō, the armor-clad Fusō- to Kongō-class battle cruisers, and the Yamato-class battleships, the last of which was recently published. They privately publish Contributions to the History of Imperial Japanese Warships.