Genre
Periodicals
21
Conference papers and proceedings
20
Legislative materials
18
Legislative hearings
14
Bibliographies
9
Congresses
6
Handbooks and manuals
5
Technical reports
4
Case studies
2
Databases
2
Statistics
2
Dictionaries
1
Directories
1
Environmental impact statements
1
Festschriften
1
Pictures
1
Posters
1
Treaties
1