Genre
Databases
Statistics
226
Academic theses
135
Maps
123
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
Bathymetric maps
5
Geographic information systems
5
Remote-sensing images
5
Geospatial data
4
Observations
4
Software
4
Data sets
3
Full-text databases
3
Graphs
3
Guidebooks
3
Legislative hearings
3
Subject dictionaries
3
Video recordings
3
Administrative regulations
2
Aerial photographs
2
Atlases
2
Digital maps
2
Electronic government information
2
Gazetteers
2
Geodatabases
2
Law digests
2
Programmed instructional materials
2
Reference works
2
Remote-sensing maps
2
Vital statistics
2
Administrative decisions
1
Annual reports
1
Bio-bibliography
1
CD-ROMs
1
Case studies
1
more ...