Genre
Maps
Bathymetric maps
10
Dictionaries
10
Geological maps
10
Topographic maps
8
Atlases
7
Remote-sensing maps
7
Graphs
6
Bibliographies
5
Databases
5
Portraits
4
Remote-sensing images
4
Academic theses
3
Illustrated works
3
Catalogs
2
Charts, diagrams, etc
2
Electronic government information
2
Geological cross-sections
2
Handbooks and manuals
2
Periodicals
2
Quadrangle maps
2
Technical reports
2
Classification
1
Conference papers and proceedings
1
Congresses
1
Directories
1
Fiction
1
Indexes
1
Photographs
1
Photomaps
1
Physical maps
1
Pictures
1
Posters
1
Registers of births, etc
1
Software
1
Surveys
1