Genre
Periodicals
77
Maps
63
Conference papers and proceedings
40
Congresses
32
Legislative hearings
27
Environmental impact statements
23
Technical reports
22
Thematic maps
19
Statistics
14
Bibliographies
8
Handbooks and manuals
7
Case studies
5
Annual reports
4
Video recordings
4
Atlases
3
Databases
2
Dictionaries
2
Software
2
Tables (Data)
2
Biographies
1
Documentary films
1
Educational films
1
Electronic books
1
Electronic government information
1
Festschriften
1
Interactive multimedia
1
Popular works
1
Remote-sensing images
1