Genre
Maps
100
Databases
42
Statistics
32
Video recordings
31
Handbooks and manuals
26
Digital maps
25
Periodicals
24
Academic theses
18
Conference papers and proceedings
18
Congresses
14
Sound recordings
14
Atlases
12
Dictionaries
11
Textbooks
9
Video recordings for the hearing impaired
7
Bathymetric maps
6
Nonfiction films
6
Technical reports
6
Catalogs
5
Illustrated works
5
Study guides
5
Biographies
4
Examinations
4
Feature films
4
Guidebooks
4
Interactive multimedia
4
Operas
4
Popular works
4
Tables (Data)
4
Bibliographies
3
CD-ROMs
3
Case studies
3
Census data
3
Documentary television programs
3
Geographic information systems
3
Geological maps
3
Instructional films
3
Nonfiction television programs
3
Photographs
3
Pictures
3
Blank forms
2
Drama
2
Educational films
2
Educational games
2
Encyclopedias
2
Forms
2
Graphs
2
Personal correspondence
2
Problems and exercises
2
Science television programs
2
more ...