Genre
Maps
9,994
Topographic maps
1,861
Remote-sensing maps
412
Periodicals
370
Bibliographies
346
Statistics
344
Databases
287
Conference papers and proceedings
265
Quadrangle maps
201
Remote-sensing images
158
Bathymetric maps
127
Technical reports
127
Graphs
126
Drawings
100
Abstracts
87
Handbooks and manuals
83
Congresses
80
Outline maps
77
Charts, diagrams, etc
74
Academic theses
65
Catalogs
61
Indexes
53
Geological maps
42
Geographic information systems
39
Physical maps
39
Surveys
39
Guidebooks
34
Serial publications
33
Directories
31
Atlases
27
Software
22
Index maps
20
Dictionaries
19
Nomenclature
18
Tables (Data)
18
Gazetteers
17
Pictures
16
Observations
15
Government publications
13
Photographs
13
Relief models
12
Case studies
10
Aerial photographs
9
Posters
9
Illustrated works
8
Classification
7
Geological cross-sections
7
Thematic maps
7
World maps
6
Aerial views
5
more ...