Genre
Libros electrónicos
5,333
Electronic books
1,093
Periodicals
468
Publicaciones seriadas
252
Internet resources
247
Libros electronicos
146
Publicaciones periódicas
135
Handbooks, manuals, etc
102
Anales
79
Problems, exercises, etc
40
Computer network resources
37
Congresses
33
Libros electr{acute}onicos
31
Congresos
26
Problemas, ejercicios, etc
22
Tesis
19
Amateurs' manuals
18
Theses
17
Study guides
14
Biography
13
Textbooks
12
Case studies
11
Libros de texto, manuales, etc
11
Dictionaries
10
Standards
9
Pictorial works
8
Problemas
8
Exhibitions
7
Manuales, etc
7
Diccionarios
6
Normas
6
Outlines, syllabi, etc
6
Tables
6
Examinations
5
Libros de texto
5
Formulae
4
Guías de estudio
4
Handbooks and manuals
4
Manuales
4
Biografía
3
Enseñanza y aprendizaje
3
Laboratory manuals
3
Safety measures
3
Biographies
2
Catalogs
2
Charts, diagrams, etc
2
Conference papers and proceedings
2
Cookbooks
2
Entrevistas
2
Examinations, questions, etc
2
more ...