Periodicals 330 Societies, etc 171 History 168 Polish Americans 92 Polish people 81 Jews 75 Genealogy 73 more ... Religious life 54 Armenian Americans 45 Armenians 41 Politics and government 38 Slavery 37 Slovak Americans 32 Slovaks 31 Minorities 29 Indians of North America 28 Antislavery movements 27 Education 26 Social conditions 26 African Americans 25 Political activity 25 Emigration and immigration 24 Railroads 22 Emigration and immigration law 18 Patriotic societies 17 Civil rights 16 Ukrainian Americans 16 Ukrainians 16 Study and teaching 15 Social life and customs 14 Civilization 13 German Americans 13 Labor unions 13 Charities 12 Hispanic Americans 12 Socialism 12 Universities and colleges 12 World War, 1939-1945 12 Economic conditions 11 Russian Americans 11 less ...