Format
Book
971,459
Electronic
28,794
Unknown
18,049
Journal
16,367
Thesis
12,160
Government Document
10,656
Conference Proceeding
9,450
Serial
8,058
Kit
7,413
Audio
6,293
Newspaper
3,127
Manuscript
2,107
Photo
1,211
Book Chapter
783
Reference Material
489
Map
181
Article
156
Musical Score
58
Physical Object
4