Género
Electronic books
588
Libros electrónicos
97
Libros electr©đnicos
21
Textbooks
12
Biography
9
Popular works
8
Problems, exercises, etc
6
Atlases
5
Identification
5
Handbooks, manuals, etc
4
Study guides
4
Case studies
2
Classification
2
Congresses
2
Early works to 1800
2
Encyclopedias
2
Laboratory manuals
2
Libros de texto
2
Obras de divulgación
2
Outlines, syllabi, etc
2
Problemas, ejercicios, etc
2
Terminology
2
Amateurs' manuals
1
Clasificación
1
Examinations, questions, etc
1
Exhibitions
1
Job descriptions
1
Miscellanea
1
Observers' manuals
1
Pictorial works
1
Sources
1
Texts
1