Genre
Maps
131
Conference papers and proceedings
35
Congresses
14
Geological maps
10
Databases
9
Bibliographies
8
Indexes
7
Bathymetric maps
5
Handbooks and manuals
5
Statistics
5
Atlases
4
Periodicals
4
Technical reports
4
Drawings
3
Guidebooks
3
Geographic information systems
2
Graphs
2
Online resources
2
Remote-sensing images
2
Thematic maps
2
Academic theses
1
Case studies
1
Dictionaries
1
Festschriften
1
Laboratory manuals
1
Personal correspondence
1
Photomaps
1
Records (Documents)
1
Records and correspondence
1
Remote-sensing maps
1
Serial publications
1
Textbooks
1