Format
Book
652,346
Unknown
21,267
Thesis
20,587
Electronic
12,677
Journal
9,104
Serial
8,052
Map
7,471
Photo
6,977
Audio
6,466
Conference Proceeding
6,153
Kit
5,419
Musical Score
2,728
Manuscript
2,605
Government Document
2,079
Book Chapter
1,893
Newspaper
804
Physical Object
235
Reference Material
180
Article
7