Electronic books 19,322 Congresses 7,087 Case studies 5,265 Periodicals 5,190 Conference papers and proceedings 5,184 Internet videos 4,296 History 4,134 Legislative hearings 2,843 Handbooks, manuals, etc 2,684 Handbooks and manuals 1,542 Educational films 1,165 Biography 915 Bibliography 814 Government publications 790 Rules and practice 778 Electronic journals 776 Legislative materials 690 Dictionaries 680 Rules 624 Biographies 570 Cross-cultural studies 536 Academic theses 478 Statistics 473 Sources 393 Études de cas 382 Study guides 379 Technical reports 379 Video recordings 372 Bibliographies 366 Early works to 1800 362 Directories 348 Interviews 340 Congrès 322 Audiobooks 307 Thèses et écrits académiques 301 Guides, manuels, etc 292 Aufsatzsammlung 272 Electronic book 261 Périodiques 258 Early works 243 bibliography 220 bibliografía 219 bibliographie 219 Congrès 210 Guides et manuels 206 Périodiques 203 Instructional films 192 Downloadable audio books 191 Études de cas 185 Examinations, questions, etc 182 Documentary films 177 reference 173 referencia 173 référence bibliographique 173 Problems, exercises, etc 154 dissertations 154 Academic Dissertation 151 Handbook 150 Records and correspondence 150 Textbooks 144 Catalogs 139 Maps 135 Conference papers and proceedings 132 Databases 132 Nonfiction films 132 Short films 131 Anecdotes 129 Congress 129 Fiction 127 doctoral dissertations 127 masters theses 127 theses 127 Livres audio 126 Autobiographies 121 CD-ROMs 113 Examinations 112 handbooks 109 Television news programs 107 Encyclopedias 106 Environmental impact statements 106 Kongress 106 Periodical 105 Humor 104 Problems and exercises 102 Software 101 graph 101 graphique 101 gráfico 101 Guides de l'étudiant 99 Archives 94 Computer network resources 94 Electronic videos 89 Photographs 89 Festschriften 88 Actes de congrès 87 Abstracts 82 Correspondence 82 Feature films 80 Internet resource 79 Criticism, interpretation, etc 74