Genre
Maps
171
Periodicals
25
Technical reports
22
Statistics
15
Case studies
10
Databases
10
Conference papers and proceedings
7
Video recordings
6
Bathymetric maps
5
Documentary films
4
Remote-sensing maps
4
Census data
3
Graphs
3
Internet videos
3
Academic theses
2
Congresses
2
Guidebooks
2
Instructional television programs
2
Interviews
2
Nonfiction television programs
2
Aerial views
1
Bibliographies
1
Catalogs
1
Electronic government publications
1
Handbooks and manuals
1
Illustrated works
1
Indexes
1
Textbooks
1
Topographic maps
1
Wall maps
1