History -- 8 Communism -- 6 History 6 Politics and government 6 Ethnic relations 4 Counterinsurgency -- 3 Guerrillas -- 2 more ... History. -- 2 Politics and government -- 2 Social conditions 2 Underground movements 2 Vietnam War, 1961-1975 -- 2 World War, 1939-1945 -- 2 Biography -- 1 British -- 1 Chinese -- 1 Constitutional history -- 1 Description and travel 1 East Indians -- 1 Economic conditions 1 Europeans -- 1 Federal government -- 1 Forecasting 1 Foreign relations -- 1 Guerillas -- 1 Industrialization -- 1 Information technology -- 1 Intergovernmental fiscal relations -- 1 Japanese occupation, 1942-1945 1 Kings and rulers 1 less ...