Genre
Maps
42
Conference papers and proceedings
19
Technical reports
8
Congresses
4
Databases
3
Handbooks and manuals
3
Legislative hearings
2
Academic theses
1
Atlases
1
Bibliographies
1
Case studies
1
Encyclopedias
1
Legislative materials
1
Observations
1
Periodicals
1
Remote-sensing maps
1
Software
1
World maps
1