Bibliography 235 History 89 Libraries 80 Publishers and publishing 58 Bibliographie 56 Library resources 53 African Americans 51 more ... Periodicals 50 Book industries and trade 48 Economic conditions 47 Colonies 46 Dissertations, Academic 44 Politics and government 38 Government publications 32 Study and teaching 31 Education 29 Archives 28 Union catalogs 27 Sources 26 Social conditions 25 Africa 23 Blacks 23 Directories 21 Civilization 20 Information services 20 Slavery 20 Agriculture 19 Labor unions 19 African periodicals 18 Black people 18 less ...