Genre
Problems, exercises, etc
5
Electronic books
4
Problems and exercises
4
Handbooks, manuals, etc
3
Records and correspondence
3
College readers
2
History
2
Vocational guidance
2
Autobiographies
1
Biographies
1
Criticism, interpretation, etc
1
Electronic journals
1
Handbooks and manuals
1
Parent-teacher
1
Periodical
1
Periodicals
1
Périodiques
1
Textbooks
1
handbooks
1
periodicals
1