Genre
Statistics
31
Conference papers and proceedings
12
Handbooks and manuals
8
Longitudinal studies
7
Bibliographies
6
Congresses
5
Examinations
3
Case studies
2
Instructional television programs
2
Legislative hearings
2
Periodicals
2
Video recordings
2
Databases
1
Electronic books
1
Encyclopedias
1
Nonfiction television programs
1
Technical reports
1