Electronic books 662 Periodicals 648 History 85 Filmed lectures 39 Congresses 37 Electronic book 36 Conference papers and proceedings 34 Internet videos 25 Bibliography 18 Handbooks, manuals, etc 14 Biography 13 Criticism, interpretation, etc 13 Case studies 12 Instructional television programs 12 Educational films 10 Bibliographies 9 Biographies 9 Dictionaries 9 Nonfiction television programs 9 Study guides 9 Handbooks and manuals 7 Livres électroniques 7 Examinations 6 Statistics 6 Encyclopedias 5 Examinations, questions, etc 5 Livres électronique 5 Longitudinal studies 5 Congress 4 Style manuals 4 Textbooks 4 Aufsatzsammlung 3 Directories 3 Guide (Descripteur de forme) 3 Instructional films 3 Problems, exercises, etc 3 Readers 3 Sources 3 Bibliography of bibliographies 2 Cross-cultural studies 2 Documentary films 2 Early works 2 Early works to 1800 2 Educational 2 Electronic resource 2 Festschriften 2 Indexes 2 Interviews 2 Methods (Music) 2 Videorecording 2 Actes de congrès 1 Cases 1 Census data 1 Church history 1 Classification 1 Congressen (vorm) 1 Databases 1 Dictionary 1 Documentary 1 Drama 1 Electronic journals 1 Encyclopedia 1 Festschrift 1 Gelegenheidsuitgaven (vorm) 1 Geographic information systems 1 Geschiedenis (vorm) 1 Handboeken (vorm) 1 Imprints 1 Juvenile literature 1 Literatuurgidsen (vorm) 1 Livre électronique (Descripteur de forme) 1 Methods 1 Outlines, syllabi, etc 1 PeriodicalsPeriodicals 1 Poetry 1 Reference works 1 Ressource Internet (Descripteur de forme) 1 Terminology 1 Video recordings 1 electronic resource 1 microform 1