World War, 1939-1945 3,529 History 1,342 Campaigns 556 Foreign relations 212 Holocaust, Jewish (1939-1945) 203 Politics and government 180 Jews 162 more ... Diplomatic history 132 Atrocities 123 Social aspects 118 Social conditions 118 World War, 1914-1918 90 Concentration camps 88 Aerial operations, American 87 Soldiers 87 Prisoners of war 86 Secret service 79 Influence 77 History and criticism 76 Underground movements 75 History, Military 74 Causes 72 Regimental histories 72 Literature and the war 70 Women 69 Aerial operations 62 African Americans 62 Armed Forces 62 Japanese Americans 57 Naval operations 57 less ...