Format
Book
3,968,474
Electronic
87,251
Unknown
64,091
Thesis
58,652
Conference Proceeding
41,981
Journal
29,326
Serial
27,712
Kit
25,001
Government Document
23,057
Manuscript
12,163
Photo
10,170
Map
6,714
Audio
5,617
Book Chapter
5,052
Musical Score
3,051
Newspaper
2,668
Reference Material
1,446
Physical Object
392
Article
253