U-Boats Under the Swastika by Jak. P. Mallmann Showell-Development of weapons, radar, new boats, among other subjects, are supported by comprehensive tables of data that make this book a fascinating account of U-boats under the Nazi flag. It is fitting that U-boats under the Swastika has been written by the son of a U-boat man: J. P. Mallmann Showell’s dad was lost at sea on his 13th operational tour with U-boat U377. Jak Mallmann was a Diesel Obermaschinist. This hardcover book is in almost new condition, with a nice dust cover. It is the reprint of the second edition and was reprinted in 1988. There are 144 pages in total, including black and white photos and charts. This book got great reviews.