History 104 Politics and government 46 Biography 21 Foreign relations 20 China 15 Communism 15 Civilization 14 Heads of state 10 World War, 1939-1945 10 Economic conditions 9 Chinese 7 Social conditions 7 Social life and customs 7 Description and travel 6 Juvenile literature 6 politics and government 5 Ming dynasty, 1368-1644 4 Relations 4 Republic, 1912-1949 4 20th century 3 Campaigns 3 Civil War, 1945-1949 3 Commerce 3 Ethnic relations 3 Explorers 3 History, Military 3 Nationalism 3 Presidents 3 Social aspects 3 Addresses, essays, lectures 2