History 130 World War, 1939-1945 83 Description and travel 46 Civilization 32 Social life and customs 26 Campaigns 22 Holocaust, Jewish (1939-1945) 20 World War, 1914-1918 16 Jews 13 Antiquities 12 Japanese Americans 11 Travel 11 Forced removal and internment, 1942-1945 10 Kings and rulers 10 Politics and government 10 Prisoners of war 8 Queens 7 Regimental histories 7 Vikings 7 Ethnic relations 6 History, Military 6 Discovery and exploration 5 Holocaust survivors 5 Iraq War, 2003-2011 5 Aerial operations, American 4 Atrocities 4 Civil rights 4 Concentration camps 4 Crusades 4 Middle Ages 4