Zvrst
Libros electrónicos
45
Electronic books
29
Periodicals
20
Electronic journals
9
Publicaciones seriadas
7
Libros electr{acute}onicos
3
Conference papers and proceedings
2
Congresses
2
Biography
1
Diccionarios
1
Dictionaries
1
Early works to 1800
1
Périodiques
1
Publicaciones periódicas
1
Sources
1