Genre
Legislative hearings
151
Legislative materials
57
Environmental impact statements
25
History
21
Congresses
9
Handbooks, manuals, etc
9
Technical reports
8
Documentary films
7
Case studies
6
Maps
4
Documentary television programs
3
Handbooks and manuals
3
Statistics
3
Biography
2
Early works to 1800
2
Environmental films
2
Legislative histories
2
Periodicals
2
Bibliography
1
Conference papers and proceedings
1
Documentary
1
Feature films
1
Nonfiction films
1
Observations
1
Statutes and codes
1
Tables
1
Textbooks
1
Trials, litigation, etc
1
e-books
1