Format
Book
19,640,040
Government Document
1,774,925
Electronic
1,133,588
Thesis
861,525
Serial
776,725
Unknown
597,342
Conference Proceeding
516,978
Journal
457,725
Map
357,644
Audio
308,244
Manuscript
194,678
Kit
168,504
Musical Score
157,123
Book Chapter
134,192
Photo
61,792
Reference Material
48,338
Newspaper
41,802
Physical Object
3,766
Article
1,449