Congresses 4,838 Electronic books 4,432 Conference papers and proceedings 3,932 Periodicals 2,506 Case studies 2,166 Statistics 1,213 Bibliography 1,011 History 905 Bibliographies 432 bibliography 421 bibliografía 419 bibliographie 419 reference 378 referencia 378 référence bibliographique 378 Handbooks, manuals, etc 318 Congress 267 graph 252 graphique 252 gráfico 252 Directories 244 Cross-cultural studies 220 Documentary films 219 Criticism, interpretation, etc 211 Aufsatzsammlung 201 Handbooks and manuals 194 Dictionaries 176 Academic theses 175 Internet videos 169 Video recordings 156 Electronic journals 150 Biography 148 Nonfiction films 132 Catalogs 125 Thèses et écrits académiques 124 Interviews 123 Literatures 109 Abstracts 106 Congrès 100 Technical reports 98 map 93 mapa 93 carte géographique 92 Feature films 91 Périodiques 89 Academic Dissertation 88 Périodiques 88 Actes de congrès 85 Computer network resources 85 Biographies 84 Études de cas 84 Kongress 81 Electronic book 79 Festschriften 79 Legislative hearings 78 Periodical 76 Statistiques 71 Conference papers and proceedings 68 Databases 68 Oral histories (literary works) 66 Maps 64 Commercial treaties 63 Congrès 62 Government publications 59 Television news programs 58 illustration 58 Patents 57 ilustración 57 Pictorial works 51 Educational films 49 Econometric models 47 Encyclopedias 46 case study 46 estudio de casos 46 étude de cas 46 DVD-Video discs 45 CD-ROMs 44 Treaties 42 Essays 41 Exhibitions 41 ILO pub 41 dissertations 41 Sources 40 Documentary television programs 39 fotografía 39 photograph 39 photographie 39 Fiction 38 libro de texto 38 manuel d'enseignement 38 textbook 38 doctoral dissertations 37 masters theses 37 theses 37 Developing countries 35 pub OIT 35 Church history 34 Statistics, Vital 34 Papal documents 32 congresses 32