Tür
Libros electrónicos
373
Electronic books
143
Periodicals
74
Electronic journals
69
Handbooks, manuals, etc
22
Internet resources
20
Périodiques
11
Study guides
8
Amateurs' manuals
7
Revistas electrónicas
6
Publicaciones seriadas
5
Guías de estudio
4
Problems, exercises, etc
3
Examinations
2
Exámenes
2
Instructional and educational works
2
Internet videos
2
Problems and exercises
2
Textbooks
2
Charts, diagrams, etc
1
Congresses
1
Diseños y planos
1
Early works to 1800
1
Enseñanza y aprendizaje
1
Formulae
1
Formulae, receipts, prescriptions
1
Libros de texto, manuales, etc
1
Libros electronicos
1
Libros electr{acute}onicos
1
Newspapers
1
Publicaciones periódicas
1
Short films
1
Standards
1
Study and teaching
1
Terminology
1