World War, 1939-1945 History 1,409 Campaigns 595 Foreign relations 215 Holocaust, Jewish (1939-1945) 212 Politics and government 187 Jews 173 Diplomatic history 134 Atrocities 133 Social conditions 132 Social aspects 123 Prisoners of war 94 World War, 1914-1918 94 Aerial operations, American 93 Secret service 89 Concentration camps 86 Soldiers 86 Underground movements 83 Influence 80 History, Military 79 Causes 78 History and criticism 77 Regimental histories 72 Women 72 Literature and the war 69 Japanese Americans 68 Aerial operations 65 Naval operations 63 Armed Forces 62 African Americans 58