Tipo
Libros electrónicos
233
Periodicals
138
Electronic journals
137
Electronic books
29
Libros electronicos
22
Périodiques
18
Examinations, questions, etc
6
Congresses
4
Internet resources
4
Revistas electrónicas
4
Problems, exercises, etc
3
Handbooks, manuals, etc
2
Libros de texto
2
Libros de texto, manuales, etc
2
Libros electr{acute}onicos
2
Newspapers
2
Textbooks
2
Amateurs' manuals
1
Case studies
1
Congresos y asambleas
1
Databases
1
Dictionaries
1
Exámenes, tests, etc
1
Juvenile literature
1
Libros de texto para extranjeros
1
Pâeriodiques
1
Problemas, ejercicios, etc
1
Problems and exercises
1
Publicaciones seriadas
1
Sources
1
Textbooks for foreign speakers
1