Genre
Maps
33
Conference papers and proceedings
15
Technical reports
13
Bibliographies
9
Thematic maps
7
Databases
3
Handbooks and manuals
3
Case studies
2
Geological maps
2
Legislative hearings
2
Periodicals
2
Abstracts
1
Congresses
1
Environmental impact statements
1
Pictures
1
Serial publications
1
Statistics
1
Topographic maps
1
Video recordings
1