History 100 World War, 1939-1945 85 Biography 69 Foreign relations 36 Politics and government 35 World War, 1914-1918 27 Campaigns 21 Great Britain 21 History, Military 20 Regimental histories 18 Personal narratives, British 15 Secret service 15 Aerial operations, British 13 Colonies 10 World war, 1939-1945 10 Prime Ministers 9 Soldiers 9 20th century 8 Army 8 Diplomatic history 8 Generals 8 Military leadership 8 World War 7 Aerial operations 6 Fighter pilots 6 Marshals 6 Admirals 5 History, Naval 5 Military policy 5 Naval operations, British 5