Genre
Maps
60
Electronic government information
19
Periodicals
7
Geological maps
5
Databases
4
Indexes
4
Gazetteers
3
Topographic maps
3
Atlases
2
Bibliographies
2
Catalogs
2
Dictionaries
2
Annual reports
1
Bathymetric maps
1
Biographies
1
Conference papers and proceedings
1
Illustrated works
1
Quadrangle maps
1
Remote-sensing maps
1
Statistics
1