History 27,561 Periodicals 20,910 Electronic books 15,274 Congresses 10,026 Statistics 8,361 Conference papers and proceedings 6,682 Biography 4,800 Bibliography 3,943 Early works to 1800 3,391 Sources 2,877 Biographies 2,833 Case studies 2,724 Directories 2,160 Internet videos 1,924 Academic theses 1,777 Handbooks, manuals, etc 1,619 Bibliographies 1,551 Early works 1,393 Dictionaries 1,333 Criticism, interpretation, etc 1,311 Curricula 1,192 Thèses et écrits académiques 1,176 Cross-cultural studies 1,153 Radio news programs 1,139 Electronic journals 1,029 Handbooks and manuals 985 Catalogs 910 Printed ephemera 896 Fiction 886 Interviews 881 Juvenile literature 739 Documentary films 690 Educational films 668 Posters 651 Journal 648 Academic Dissertation 622 Textbooks 575 Video recordings 570 Instructional television programs 561 dissertations 561 Diaries 538 Databases 517 Legislative hearings 502 theses 492 doctoral dissertations 491 masters theses 491 Broadsides 484 Correspondence 481 Autobiographies 455 Report 455 Sermons 447 Juvenile fiction 446 Périodiques 439 Maps 409 Périodiques 409 Nonfiction television programs 405 Congrès 400 Pictorial works 392 Exhibitions 386 DVD-Video discs 382 Archives 370 Abstracts 367 Festschriften 365 Indexes 363 Juvenile works 355 Periodical 353 Documentary television programs 349 Government publications 339 Essays 330 Registers 319 Nonfiction films 317 Legislative materials 315 Congress 305 Oral histories (literary works) 275 Drama 274 Aufsatzsammlung 271 Serial publications 268 Études de cas 267 Feature films 261 Encyclopedias 260 Congrès 256 Anecdotes 253 Exhibition catalogs 247 Photographs 247 Church history 246 Outlines, syllabi, etc 246 Oral histories 230 Terminology 229 Longitudinal studies 217 Electronic book 214 Poetry 212 Annual reports 209 Statistiques 203 Actes de congrès 194 Tracts (literary works) 189 Poems 186 Children's maps 180 Publishers' advertisements 180 Education periodicals 177 Personal correspondence 173