Genre
Amateurs' manuals
1
Congresos y asambleas
1
Congresses
2
Dictionaries
1
Electronic books
25
Electronic journals
2
Examinations, questions, etc
6
Exámenes, tests, etc
1
Handbooks, manuals, etc
2
Libros de texto
2
Libros de texto, manuales, etc
2
Libros electronicos
22
Libros electrónicos
227
Libros electr{acute}onicos
1
Periodicals
4
Problemas, ejercicios, etc
1
Problems and exercises
1
Problems, exercises, etc
3
Publicaciones seriadas
1
Revistas electrónicas
4
Sources
1
Textbooks
2