Genre
Periodicals
63
Handbooks, manuals, etc
36
Textbooks
21
Case studies
17
Congresses
15
Problems, exercises, etc
15
Electronic books
13
Dictionaries
10
Encyclopedias
9
Biography
8
Study guides
6
Popular works
4
Examinations, questions, etc
3
Laboratory manuals
2
Amateurs' manuals
1
Anecdotes
1
Atlases
1
Drawings
1
Examinations
1
Formulae
1
Handbooks
1
Handbooks and manuals
1
History
1
Interviews
1
Laboratory Manuals
1
Life skills guides
1
Observers' manuals
1
Patterns
1
Periodiques
1
Specifications
1
Working drawings
1