Format
Book
2,905,512
Unknown
96,710
Electronic
37,273
Thesis
23,851
Audio
19,985
Conference Proceeding
19,062
Journal
14,547
Manuscript
12,378
Map
12,271
Serial
11,534
Government Document
9,229
Musical Score
6,429
Newspaper
1,910
Kit
1,247
Physical Object
649
Photo
537
Book Chapter
454
Reference Material
387
Article
208