History 3,223 Biography 1,437 Politics and government 1,340 World War, 1939-1945 1,334 Campaigns 679 Juvenile literature 377 Foreign relations 329 Description and travel 243 United States 224 Malaysia 200 Social conditions 195 World War, 1914-1918 180 Civilization 179 Economic conditions 162 World war, 1939-1945 159 History, Military 143 Personal narratives, American 134 Vietnam War, 1961-1975 134 Aerial operations 128 Presidents 125 Politicians 123 Pictorial works 115 World politics 112 Vietnamese Conflict, 1961-1975 111 Personal narratives 110 Terrorism 102 Social life and customs 101 Naval operations 100 World War 99 Regimental histories 95