Genre
Maps
404
Statistics
41
Bibliographies
23
Conference papers and proceedings
21
Periodicals
13
Geological maps
11
Technical reports
10
Topographic maps
8
Databases
7
Directories
5
Guidebooks
4
Abstracts
2
Bathymetric maps
2
Catalogs
2
Congresses
2
Graphs
2
Serial publications
2
Aerial views
1
Dictionaries
1
Geographic information systems
1
Indexes
1
Laboratory manuals
1
Literature
1
Observations
1
Quadrangle maps
1
Remote-sensing images
1