Generoa
Electronic books
65
Libros electrónicos
58
Internet videos
52
Electronic journals
51
Short films
51
Internet resources
39
Periodicals
39
Handbooks, manuals, etc
10
Amateurs' manuals
4
Miscellanea
2
Charts, diagrams, etc
1
Congresses
1
Libros de texto, manuales, etc
1
Outlines, syllabi, etc
1
Périodiques
1
Textbooks
1