Genre
Problems and exercises
29
Popular works
20
Trivia and miscellanea
12
Puzzles and games
8
Examinations
4
Handbooks and manuals
4
Dictionaries
3
Early works to 1800
3
Study guides
3
Tables (Data)
3
Biographies
2
Fiction
2
Humor
2
Literature
2
Allegories
1
Anecdotes
1
Autobiographies
1
Bibliographies
1
Bio-bibliography
1
Charts, diagrams, etc
1
Comics (Graphic works)
1
Conference papers and proceedings
1
Congresses
1
Constitution
1
Formulae
1
Graphic novels
1
Graphs
1
Programmed instructional materials
1
Sources
1
Statistics
1