Genre
Libros electrónicos
111
Electronic journals
67
Periodicals
65
Electronic books
29
Périodiques
17
Internet resources
11
Congresses
3
Revistas electrónicas
3
Collections
1
Computer network resources
1
Conference papers and proceedings
1
Handbooks, manuals, etc
1
Internet videos
1
Newspapers
1
Observations
1
Pollution
1
Publicaciones periódicas
1
Publicaciones seriadas
1
Short films
1
research
1