Genre
Indexes
Periodicals
53
History
40
Bibliography
38
Sources
22
Index
14
Bibliographies
10
Biography
10
Catalogs
9
Digests
7
indexes (reference sources)
7
Classification
6
Congresses
6
Abstracts
5
Biographies
5
Exhibitions
5
Genealogy
5
Microform catalogs
5
Registers
5
Statistics
5
Concordances
4
Conference papers and proceedings
4
Electronic reference sources
4
Registers (Lists)
4
Cases
3
Catalog
3
Collections
3
Dictionaries
3
Early works to 1800
3
Electronic books
3
Indexes (reference sources)
3
Pictorial works
3
Tables
3
Verzeichnis
3
CD-ROMs
2
Catalogues
2
Criticism, interpretation, etc
2
Directories
2
Exhibition catalogs
2
Maps
2
Registers (form)
2
Terminology
2
Texts
2
Trials, litigation, etc
2
Archives
1
Calendar
1
Catalogs and collections
1
Chronologies
1
Classifications (form)
1
Comparative studies
1
more ...