Kaga and Akagi

Hans Lengerer was in the government service (executive) until retirement. After contacts with the late Erich Gröner, he was encouraged by the late Jürgen Rohwer to publish on the IJN. He has written more than 50 articles and several books, including Die Flugzeugträger der Kaiserlichen Japanischen Marine und des Heeres, Band I. He lives in Germany. Lars Ahlberg is a retired army officer; he lives in Sweden. Together with Hans Lengerer, he privately publishes Contributions to the History of Imperial Japanese Warships.