History 583 World War, 1939-1945 255 Biography 248 Great Britain 223 Foreign relations 165 Politics and government 136 Campaigns 92 Leadership 82 World War, 1914-1918 81 Juvenile literature 60 Military policy 60 Management 59 History, Military 54 Aerial operations, British 46 Army 44 Personal narratives, British 36 World politics 35 Generals 33 Armed Forces 30 Colonies 30 Secret service 29 History, Naval 27 Regimental histories 27 United States 27 Intelligence service 26 World war, 1939-1945 26 Soldiers 23 Case studies 22 Fiction 22 Law 22