Tür
Sources
90
Periodicals
24
History
9
Abstracts
4
Records and correspondence
4
Archives
3
Biography
3
Catalogs
3
Congresses
3
Early works to 1800
3
Newspapers
3
Biographies
2
Charts, diagrams, etc
2
Directories
2
Statistics
2
Bibliography
1
Diaries
1
Film catalogs
1
Guidebooks
1
Juvenile literature
1
Maps
1
Microform catalogs
1
Périodiques
1
Tables
1
Textbooks
1
Treaties
1