Genre
Electronic books
167
Periodicals
82
Electronic journals
44
Outlines
13
Examinations, questions, etc
12
Examination Questions
11
Outlines, syllabi, etc
10
Atlases
8
Handbooks, manuals, etc
8
Handbooks
4
Biography
3
Laboratory manuals
3
Périodiques
3
Laboratory Manuals
2
Programmed Instruction
2
Study guides
2
Zeitschrift
2
Atlas
1
Catalogs
1
Congresses
1
Correspondence
1
Experiments
1
Libros electrónicos
1
Observations
1
Problems, exercises, etc
1
Textbooks
1