History 3,054 Biography 1,317 World War, 1939-1945 1,260 Politics and government 1,249 Campaigns 641 Juvenile literature 341 Foreign relations 314 Description and travel 221 United States 216 Social conditions 180 Malaysia 179 World War, 1914-1918 175 Civilization 174 Economic conditions 146 World war, 1939-1945 144 History, Military 138 Personal narratives, American 129 Vietnam War, 1961-1975 127 Aerial operations 123 Presidents 118 Politicians 108 World politics 107 Pictorial works 104 Vietnamese Conflict, 1961-1975 104 Personal narratives 101 Social life and customs 98 Naval operations 96 Terrorism 96 World War 94 Regimental histories 89