Genre
Periodicals
27
Conference papers and proceedings
25
Legislative hearings
18
Legislative materials
13
Bibliographies
11
Technical reports
10
Handbooks and manuals
5
Congresses
4
Maps
3
Statistics
3
Activity books
1
Case studies
1
Databases
1
Dictionaries
1
Environmental impact statements
1
Guidebooks
1
Observations
1
Statutes and codes
1
Treaties
1