Genre
Electronic books
Internet resources
317
Outlines, syllabi, etc
15
Handbooks, manuals, etc
12
Congresses
5
Case studies
4
Tables
4
Formulae
3
Problems, exercises, etc
3
Study guides
2
Amateurs' manuals
1
Classification
1
Computer network resources
1
Instructional and educational works
1
Libros electrónicos
1
Problems and exercises
1
Terminology
1
research
1