Genre
Congresses
1,568
Conference papers and proceedings
1,152
Periodicals
849
Electronic books
796
Technical reports
620
History
271
Observations
267
Catalogs
230
Early works to 1800
223
Maps
173
Bibliography
159
Biography
129
Charts, diagrams, etc
124
Bibliographies
109
Juvenile literature
96
Directories
93
Biographies
88
Dictionaries
87
Statistics
85
Electronic journals
78
Popular works
75
Reports
70
Exhibitions
69
Pictorial works
62
Handbooks, manuals, etc
61
Databases
60
Périodiques
50
Academic theses
47
Booksellers' catalogs
46
Tables
46
Handbooks and manuals
45
Congress
43
Juvenile works
43
Graphs
36
Documentary films
35
Abstracts
34
Documentary television programs
34
Video recordings
33
Festschriften
32
Périodiques
32
Video recordings for the hearing impaired
31
Atlases
30
Case studies
30
Nonfiction films
29
Encyclopedias
28
Government publications
28
Periodical
27
CD-ROMs
26
Textbooks
26
Nonfiction television programs
25
more ...