Genre
Maps
849
Statistics
132
Periodicals
113
Databases
87
Remote-sensing maps
80
Topographic maps
58
Technical reports
54
Conference papers and proceedings
51
Remote-sensing images
36
Bibliographies
34
Bathymetric maps
33
Graphs
29
Handbooks and manuals
15
Geographic information systems
9
Guidebooks
9
Academic theses
7
Photographs
7
Catalogs
6
Directories
6
Relief models
6
Atlases
4
Congresses
4
Dictionaries
4
Pictures
4
Software
4
Aerial photographs
3
Charts, diagrams, etc
3
Observations
3
Posters
3
Aerial views
2
Case studies
2
Environmental impact statements
2
Indexes
2
Motion pictures
2
Nomenclature
2
Video recordings
2
Archives
1
Catalogs and collections
1
Chronologies
1
Drawings
1
Gazetteers
1
Geodatabases
1
Geological maps
1
Geospatial data
1
Globes
1
Identification
1
Illustrated works
1
Index maps
1
Laboratory manuals
1
Music
1
more ...