Genre
Databases
Statistics
226
Academic theses
135
Maps
126
Census data
79
Dictionaries
72
Bibliographies
21
Handbooks and manuals
20
Periodicals
17
Catalogs
15
Encyclopedias
14
Technical reports
14
Conference papers and proceedings
13
Biographies
12
Directories
10
Indexes
9
Illustrated works
8
Topographic maps
8
Census, 2000
7
Abstracts
6
Remote-sensing images
6
Bathymetric maps
5
Geographic information systems
5
Geospatial data
4
Observations
4
Software
4
Data sets
3
Full-text databases
3
Graphs
3
Guidebooks
3
Legislative hearings
3
Programmed instructional materials
3
Subject dictionaries
3
Video recordings
3
Administrative regulations
2
Aerial photographs
2
Atlases
2
CD-ROMs
2
Digital maps
2
Electronic government information
2
Gazetteers
2
Geodatabases
2
Law digests
2
Reference works
2
Remote-sensing maps
2
Vital statistics
2
Administrative decisions
1
Annual reports
1
Bio-bibliography
1
Case studies
1
more ...