Gènere
Libros electrónicos
207
Periodicals
156
Electronic journals
102
Publicaciones periódicas
59
Electronic books
14
Périodiques
12
Newspapers
5
Internet resources
3
Computer network resources
2
Libros electr{acute}onicos
2
Conference papers and proceedings
1
Congresses
1
Libros electronicos
1
Outlines, syllabi, etc
1
Pâeriodiques
1
Publicaciones seriadas
1
methods
1
periodicals
1