Genre
Maps
16
Bathymetric maps
6
Photographs
5
Databases
2
Motion pictures
2
Observations
2
Periodicals
2
Statistics
2
Academic theses
1
Case studies
1
Catalogs
1
Documentary television programs
1
Fiction
1
Instructional television programs
1
Nonfiction television programs
1
Remote-sensing maps
1
Technical reports
1
Topographic maps
1