Xénero
Libros electrónicos
443
Periodicals
204
Electronic journals
177
Electronic books
27
Libros electronicos
23
Publicaciones periódicas
22
Périodiques
18
Revistas electrónicas
8
Data processing
7
Handbooks, manuals, etc
7
Problems, exercises, etc
7
Problems, exercices, etc
5
Libros de texto, manuales, etc
4
Normas
4
Problemas, ejercicios, etc
3
Dictionaries
2
Newspapers
2
Case studies
1
Congresses
1
Directories
1
Examinations
1
Exámenes
1
Instructional and educational works
1
Libros de texto
1
Libros electr{acute}onicos
1
Manuales
1
Manuales, etc
1
Problemas resueltos
1
Problems and exercises
1
Standards
1
Statistics
1
Textbooks
1
periodika
1