Genre
Study guides
Examinations
161
Problems and exercises
22
Handbooks and manuals
12
Textbooks
8
Outlines and syllabi
6
Case studies
5
Educational films
4
Internet videos
4
Periodicals
4
Video recordings
4
Sources
3
Software
2
Tragedies (Drama)
2
Biographies
1
CD-ROMs
1
Controlled vocabularies
1
Encyclopedias
1
Fiction
1
Logic puzzles
1
Maps
1
Serial publications
1
Sound recordings
1
Statistics
1