Format
Book
1,938,756
Thesis
26,612
Conference Proceeding
24,225
Journal
11,703
Unknown
9,975
Serial
9,258
Government Document
8,667
Electronic
5,562
Kit
4,126
Map
2,478
Manuscript
1,493
Book Chapter
1,354
Audio
1,153
Newspaper
767
Reference Material
576
Musical Score
415
Photo
236
Article
226
Physical Object
34