World War, 1939-1945 History 540 Foreign relations 284 Diplomatic history 190 Secret service 184 Campaigns 177 Guerre mondiale, 1939-1945 159 more ... Politics and government 116 Regimental histories 107 Aerial operations, British 78 World War, 1914-1918 61 Causes 56 Social aspects 53 Cryptography 51 Military intelligence 47 Prisoners of war 45 Women 42 Influence 40 Naval operations, British 40 Underground movements 40 Diplomatic relations 37 Generals 37 Histoire 36 History, Military 36 Military leadership 34 Economic aspects 33 History and criticism 33 Relations extérieures 33 Social conditions 33 Spies 32 less ...