Genre
Maps
35
Technical reports
12
Periodicals
6
Statistics
5
Conference papers and proceedings
2
Environmental impact statements
2
Posters
2
Aerial views
1
Atlases
1
Bibliographies
1
Catalogs
1
Geographic information systems
1
Guidebooks
1
Identification
1
Observations
1
Remote-sensing maps
1
Topographic maps
1