Periodicals 13,688 History 13,314 Electronic books 9,799 Congresses 6,843 Conference papers and proceedings 5,003 Early works to 1800 4,799 Bibliography 4,599 Biography 2,906 Early works 2,410 Dictionaries 2,375 Biographies 1,922 Bibliographies 1,698 Juvenile literature 1,607 Catalogs 1,453 Internet videos 1,378 Periodical 1,282 Electronic journals 1,003 Educational films 970 Popular works 943 Directories 916 Statistics 906 Miscellanea 835 Juvenile works 772 Textbooks 697 Criticism, interpretation, etc 649 Instructional television programs 608 Indexes 596 Trivia and miscellanea 489 Handbooks, manuals, etc 484 Congress 482 Exhibitions 468 Terminology 439 Sources 437 Essays 433 Abstracts 416 Laboratory manuals 406 Documentary films 397 Encyclopedias 377 Festschriften 373 Handbooks and manuals 360 Video recordings 337 Périodiques 334 Laboratory Manual 321 Périodiques 316 Directory 315 Bio-bibliography 298 Exhibition catalogs 298 Congrès 291 Readers 284 Case studies 280 Nonfiction television programs 278 Aufsatzsammlung 265 Pre-Linnean works 265 Interviews 253 Correspondence 245 Fiction 237 Congrès 222 Databases 212 Essay 210 Academic theses 208 periodicals 206 Union lists 198 Electronic book 192 Poetry 184 Dictionary 181 Anecdotes 174 Laboratory Manuals 173 Problems, exercises, etc 152 Thèses et écrits académiques 148 Documentary television programs 136 Drama 134 Humor 131 Pictorial works 131 bibliography 128 Autobiographies 125 Collected Work 122 Computer network resources 122 Union catalogs 121 Records and correspondence 118 Catalog 116 Cross-cultural studies 109 Readers (Publications) 108 Kongress 106 Lectures 103 Personal correspondence 102 Bibliographie 101 Index 100 Tables 100 Advertisements 97 Ouvrages avant 1800 97 Problems and exercises 96 Annotations (Provenance) 95 Juvenile fiction 93 Academic Dissertation 92 Conference proceedings 91 Association copies (Provenance) 87 dictionaries 84 Actes de congrès 83 DVD-Video discs 82 Examinations, questions, etc 82