Genre
Maps
54
Technical reports
12
Conference papers and proceedings
7
Bibliographies
4
Handbooks and manuals
4
Atlases
3
Classification
2
Congresses
2
Literature
2
Pictures
2
Posters
2
Remote-sensing maps
2
Trivia and miscellanea
2
Bathymetric maps
1
Calendars
1
Databases
1
Electronic government information
1
Illustrated works
1
Periodicals
1
Surveys
1