Genre
Maps
307
Databases
142
CD-ROMs
45
Periodicals
23
Charts, diagrams, etc
16
Digital maps
16
Geographic information systems data
14
Observations
14
Academic theses
11
DVD-ROMs
9
Atlases
8
Statistics
8
Bathymetric maps
7
Road maps
7
Geological maps
6
Graphs
6
Quadrangle maps
6
Census, 2000
5
Geospatial data
5
Interactive multimedia
5
Remote-sensing images
5
Aeronautical charts
4
Census, 22nd, 2000
4
Handbooks, manuals, etc
4
Raster data
4
Rules and practice
4
Tourist maps
4
Catalogs
3
Congresses
3
Geographic information systems
3
Thematic maps
3
Aerial photographs
2
Bibliography
2
Classification
2
Computer network resources
2
Dictionaries
2
Government publications
2
History
2
Maps, Topographic
2
Photographs
2
Pictorial works
2
Programmed instruction
2
Records and correspondence
2
Remote-sensing maps
2
Rules
2
Software
2
Abstracts
1
Bibliographies
1
Census data
1
Census, 1990
1
more ...