History 121 World War, 1939-1945 112 Biography 90 Politics and government 46 Foreign relations 41 World War, 1914-1918 29 Great Britain 26 Campaigns 25 History, Military 22 Regimental histories 20 Prime Ministers 17 Secret service 17 Personal narratives, British 15 Aerial operations, British 13 Military leadership 12 Colonies 10 Generals 10 World war, 1939-1945 10 Diplomatic history 9 Soldiers 9 20th century 8 Army 8 World War 8 Naval operations, British 7 Aerial operations 6 Fighter pilots 6 History, Naval 6 Marshals 6 Military policy 6 Public opinion 6