Gènere
Amateurs' manuals
6
Case studies
9
Charts, diagrams, etc
1
Classification
1
Computer network resources
60
Design and construction
2
Electronic books
708
Formulae
4
Handbooks, manuals, etc
61
Internet resources
317
Observations
1
Outlines, syllabi, etc
24
Problems, exercises, etc
8
Programming
1
Standards
1
Study guides
8
Tables
6
Terminology
2
Textbooks
4
methods
2
research
1