Genre
Sources
39
Abstracts
21
Congresses
18
Bibliography
10
Statistics
10
Textbooks
9
Case studies
4
Biography
3
Designs and plans
3
Electronic books
3
Archives
2
Catalogs
2
Fiction
2
Indexes
2
Periodicals
2
Pictorial works
2
Poetry
2
Songs and music
2
Chronology
1
Conference papers and proceedings
1
Directories
1
Drama
1
Handbooks, manuals, etc
1
Literary collections
1
Reviews
1
Sermons
1
Statistics, Vital
1