History 451 Social conditions 177 Social aspects 82 Politics and government 77 Race relations 77 Social life and customs 60 African Americans 50 Mexican Americans 49 Ethnic relations 47 Immigrants 44 Indians of North America 43 Economic conditions 40 Motion picture industry 40 Ethnic identity 37 Law and legislation 37 Emigration and immigration 36 Environmental aspects 36 Motion pictures 31 Political activity 30 Description and travel 29 Community life 27 Education 27 Government policy 26 Civil rights 25 Chinese Americans 24 History and criticism 24 Economic aspects 23 City planning 22 Environmental conditions 21 Gangs 21 Japanese Americans 21 Political aspects 21 Gold discoveries 20 Minorities 20 Hispanic Americans 19 Natural history 19 Water-supply 19 Prevention 18 Employment 17 Migrant agricultural laborers 17 Women 17 Agricultural laborers 16 Earthquakes 16 Riots 16 Student movements 16 Labor unions 15 Police 15 Cultural assimilation 14 Gold mines and mining 14 Research 14 Antiquities 13 College students 13 Indigenous peoples 13 Racism 13 Wine and wine making 13 World War, 1939-1945 13 Civilization 12 Community development 12 Community gardens 12 Family relationships 12 Governors 12 Homelessness 12 Legal status, laws, etc 12 Management 12 Marijuana 12 Mexicans 12 Prisoners 12 Services for 12 Youth 12 American literature 11 Asian Americans 11 Frontier and pioneer life 11 In literature 11 Korean Americans 11 Missions 11 Motion picture actors and actresses 11 Religion 11 Social change 11 Students 11 Children 10 Civil rights movements 10 Family members 10 Filipino Americans 10 Fires 10 Homeless persons 10 Intellectual life 10 Medical care 10 Murder 10 Political activists 10 Popular culture 10 Prisons 10 Public health 10 Race identity 10 Religious aspects 10 School improvement programs 10 Agriculture 9 Attitudes 9 Childhood and youth 9 Environmental policy 9 Family 9