Maps 57,294 Geological maps 5,763 Periodicals 5,498 Congresses 3,989 Guidebooks 3,665 Conference papers and proceedings 2,913 Electronic books 2,814 Bibliography 2,792 Cartes géographiques 1,826 History 1,110 Charts, diagrams, etc 840 Bibliographies 788 Academic theses 556 Dictionaries 528 Topographic maps 481 Quadrangle maps 464 Early works to 1800 443 Biography 376 Remote-sensing maps 371 Internet videos 362 Indexes 354 Catalogs 327 Thèses et écrits académiques 325 Geological cross-sections 317 Statistics 259 Nomenclature 258 geological maps 250 Databases 248 Cartes géologiques 243 Maps, Topographic 243 Biographies 235 Index maps 230 Atlases 227 Early works 225 Abstracts 222 Terminology 215 Thematic maps 200 Pictorial works 192 Surveys 192 Electronic journals 191 Academic Dissertation 188 CD-ROMs 180 Textbooks 169 Juvenile literature 167 Physical maps 165 Périodiques 155 Festschriften 148 Educational films 145 dissertations 133 Mine maps 126 doctoral dissertations 124 masters theses 124 theses 124 Guides touristiques 118 travel guidebooks 117 Handbooks, manuals, etc 114 Laboratory manuals 113 Popular works 113 Geographic information systems data 101 Périodiques 101 Graphs 97 Directories 93 Congress 92 Maps, Manuscript 91 Remote-sensing images 89 Bathymetric maps 88 Periodical 83 Digital maps 81 Documentary films 81 Congrès 78 Juvenile works 78 Catalogs and collections 77 Electronic book 76 Handbooks and manuals 75 Maps, Physical 74 Zeitschrift 73 Actes de congrès 68 Printed ephemera 65 Guidebook 63 Congrès 61 Exhibitions 61 Pre-Linnean works 58 periodicals 58 Facsimiles 56 Documentary television programs 54 Drawings 54 Outlines, syllabi, etc 53 Science films 53 Advertisements 51 Manuscripts 51 Exhibition catalogs 50 Observations 50 Bio-bibliography 49 Diaries 49 Guides 49 Software 48 Annotations (Provenance) 47 Legislative materials 46 Serial publications 46 Manuscript maps 45