סוגה
Libros electrónicos
88
Periodicals
61
Electronic journals
56
Electronic books
23
Internet resources
9
Périodiques
8
Handbooks, manuals, etc
6
Problems, exercises, etc
5
Internet videos
4
Short films
4
Problemas, ejercicios, etc
3
Examinations, questions, etc
2
Congresses
1
Dictionaries
1
Libros electronicos
1
Revistas electrónicas
1
Tidsskrifter
1