Genre
Case studies
22
Handbooks, manuals, etc
19
Bibliography
11
Problems, exercises, etc
8
Juvenile literature
7
Problems and exercises
7
Study guides
7
Congresses
4
Documentary films
3
Examinations
3
Examinations, questions, etc
3
Popular works
3
Statistics
3
Activity programs
2
Biography
2
Educational films
2
History
2
Legislative hearings
2
Academic theses
1
Aids and devices
1
Anecdotes
1
Bibliographies
1
Books and reading
1
Cases
1
Catalogs
1
Computer games
1
Conference papers and proceedings
1
Documentary
1
Handbooks and manuals
1
Internet videos
1
Longitudinal studies
1
Sponsored films
1
Textbooks
1