20th century History Biography 8 19th century 6 Naval art and science 5 World War, 1914-1918 5 21st century 4 Arms race 4 Naval history, Modern 4 United States 4 Armed Forces 3 Australia 3 Cold War 3 Foreign relations 3 History, Military 3 Pictorial works 3 Politics and goverment 3 Politics and government 3 Sailors 3 Terrorism 3 Weapons systems 3 Women 3 World War, 1939-1945 3 Armed forces 2 Campaigns 2 Case studies 2 Encyclopedias 2 Fiction 2 Geishas 2 Great Britain 2