- EbookGerman Destroyers of World War IIGerhard Koop
- EbookBattleships of the Scharnhorst ClassGerhard Koop
- EbookHeavy Cruisers of the Admiral Hipper ClassGerhard Koop
- EbookGerman Light Cruisers of World War IIGerhard Koop
- EbookBattleships of the Bismarck ClassGerhard Koop
- EbookPocket Battleships of the Deutschland ClassGerhard Koop