Genre
Maps
38
Technical reports
12
Statistics
7
Periodicals
6
Conference papers and proceedings
2
Environmental impact statements
2
Posters
2
Aerial views
1
Atlases
1
Bibliographies
1
Catalogs
1
Databases
1
Geographic information systems
1
Guidebooks
1
Identification
1
Observations
1
Remote-sensing maps
1
Topographic maps
1