Tür
Congresses
1,571
Conference papers and proceedings
1,154
Periodicals
849
Electronic books
792
Technical reports
620
History
272
Observations
267
Catalogs
230
Early works to 1800
223
Maps
173
Bibliography
159
Biography
128
Charts, diagrams, etc
124
Bibliographies
109
Juvenile literature
95
Directories
93
Biographies
87
Dictionaries
87
Statistics
85
Electronic journals
77
Popular works
75
Reports
70
Exhibitions
69
Pictorial works
62
Handbooks, manuals, etc
61
Databases
60
Academic theses
47
Booksellers' catalogs
46
Tables
46
Handbooks and manuals
45
Congress
43
Juvenile works
43
Périodiques
40
Périodiques
39
Documentary films
36
Graphs
36
Abstracts
34
Documentary television programs
34
Video recordings
33
Festschriften
32
Video recordings for the hearing impaired
32
Atlases
30
Case studies
30
Nonfiction films
30
Encyclopedias
28
Government publications
28
Periodical
27
Textbooks
27
CD-ROMs
26
Nonfiction television programs
25
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