Electronic books 1,252 Congresses 169 Documentary films 127 Electronic book 121 History 109 Conference papers and proceedings 91 Case studies 85 Educational films 56 Internet videos 44 Videorecording 34 Documentary television programs 32 Nonfiction films 24 Television news programs 22 Handbooks, manuals, etc 18 Biography 16 Congress 13 Feature films 12 Biographies 11 Environmental films 10 Short films 9 Environmental television programs 8 Handbooks and manuals 8 Criticism, interpretation, etc 6 Juvenile literature 6 Aufsatzsammlung 5 Bibliography 5 Educational television programs 5 Instructional films 5 Interviews 5 Sources 5 Filmed lectures 4 Textbooks 4 Architectural drawings 3 Computer network resources 3 Cross-cultural studies 3 Databases 3 Designs and plans 3 Documentary 3 Encyclopedias 3 Film clips 3 Instructional television programs 3 Juvenile works 3 Popular works 3 Statistics 3 Streaming videos 3 Trials, litigation, etc 3 United States 3 Bibliographies 2 Cases 2 Catalogs 2 Classification 2 Documentary-style television programs 2 Exhibition catalogs 2 Exhibitions 2 Fallstudiensammlung 2 Fiction 2 Filmed interviews 2 Folklore 2 Livres électronique 2 Military history 2 Nature television programs 2 Photomicrography 2 Review 2 Rules 2 Streaming video 2 Television comedies 2 Television programs 2 Wildlife television programs 2 3-D films 1 Academic theses 1 American essays 1 Anecdotes 1 Animated television programs 1 Art 1 Biographical films 1 Case Reports 1 Children's television programs 1 Claims 1 Detective and mystery fiction 1 Detective and mystery stories 1 Dictionaries 1 Drama 1 Electronic resource 1 Environmental conditions 1 Erfurt (2007) 1 Evaluation Study 1 Fiction television programs 1 Forecasts 1 Geographic information systems 1 Geschiedenis (vorm) 1 Guides et manuels 1 ILO pub 1 In art 1 Indexes 1 Indoor air pollution 1 Interactive videos 1 Juvenile fiction 1 Juvenile films 1 Kongress 1 Lectures 1