Genre
Maps
4,274
Geological maps
625
Congresses
481
Conference papers and proceedings
367
Electronic books
288
Charts, diagrams, etc
206
Guidebooks
205
Cartes géographiques
146
Periodicals
88
Internet videos
67
Geological cross-sections
66
Bathymetric maps
62
Educational films
50
Thematic maps
49
Academic theses
46
Quadrangle maps
43
CD-ROMs
35
Festschriften
35
History
34
Remote-sensing maps
33
Graphs
31
Topographic maps
30
Atlases
29
Abstracts
26
Databases
26
Drawings
22
Maps, Topographic
22
Thèses et écrits académiques
22
Bibliography
20
Dictionaries
20
Science films
20
Cartes géologiques
19
World maps
19
geological maps
19
Early works to 1800
17
Physical maps
17
Terminology
16
Aufsatzsammlung
14
dissertations
14
Electronic journals
13
Périodiques
12
Textbooks
11
doctoral dissertations
11
masters theses
11
theses
11
Early works
10
Maps, Physical
10
Remote-sensing images
10
Academic Dissertation
8
Geographic information systems data
8
more ...