Genre
Maps
34
Statistics
17
Technical reports
11
Databases
7
Directories
7
Bathymetric maps
5
Topographic maps
5
Academic theses
4
Periodicals
4
Remote-sensing maps
4
Conference papers and proceedings
3
Case studies
2
Graphs
2
Aerial photographs
1
Archives
1
Bibliographies
1
Census data
1
Guidebooks
1
Index maps
1
Relief models
1
Remote-sensing images
1
Thematic maps
1