Genre
Maps
24
Periodicals
18
Conference papers and proceedings
10
Serial publications
6
Atlases
3
Congresses
3
Statistics
3
Technical reports
2
Aerial photographs
1
Bathymetric maps
1
Bibliographies
1
Government publications
1
Graphs
1
Online resources
1
Outlines and syllabi
1
Thematic maps
1
World maps
1