Format
Book
3,199,496
Thesis
266,670
Audio
70,237
Musical Score
68,726
Serial
62,959
Journal
45,813
Conference Proceeding
44,506
Manuscript
31,806
Unknown
28,082
Electronic
23,645
Map
21,139
Book Chapter
17,330
Kit
6,537
Photo
2,483
Newspaper
1,757
Government Document
975
Reference Material
538
Physical Object
133
Article
121