Genre
Instructional films
23
Internet videos
15
Nonfiction films
15
Educational films
7
Textbooks
5
Conference papers and proceedings
3
Congresses
3
Biography
2
Case studies
2
History
2
Instructional television programs
2
Amateurs' manuals
1
Audiobooks
1
Biographies
1
Criticism, interpretation, etc
1
Geographic information systems
1
Handbooks and manuals
1
Handbooks, manuals, etc
1
Interviews
1
Miscellanea
1
Nonfiction television programs
1
Patents
1
Popular works
1
Trivia and miscellanea
1
geographic information systems
1
proceedings (reports)
1