Genre
Libros electrónicos
781
Periodicals
84
Publicaciones seriadas
76
Electronic books
64
Publicaciones periódicas
12
Internet resources
8
Libros electronicos
5
Outlines
3
Outlines, syllabi, etc
3
Textbooks
3
Bibliography
2
Computer network resources
2
Examination Questions
2
Examinations, questions, etc
2
Libros de texto
2
Libros electrónicos
2
Popular works
2
Problems, exercises, etc
2
Biography
1
Handbooks, manuals, etc
1
Laboratory manuals
1
Libros electr{acute}onicos
1
Mauales de laboratorio
1
Observations
1
Périodiques
1
Problemas, ejercicios, etc
1
Study guides
1