Politics and government History 256 Underground press publications 118 Civil rights 104 Social conditions 96 Protest movements 86 Counterculture 80 Political activists 80 Vietnam War, 1961-1975 73 Political aspects 62 Foreign relations 61 Economic conditions 57 Radicalism 46 Student movements 45 Race relations 44 Political activity 35 Social movements 34 Political culture 30 Political parties 27 African Americans 25 Populism 24 Social life and customs 23 Public opinion 22 World politics 22 Democracy 21 Civilization 20 Intellectual life 20 Social aspects 20 Socialism 19 Ethnic relations 18