Format
Book
38,730,078
Government Document
1,785,868
Electronic
1,692,207
Serial
1,380,423
Thesis
1,345,525
Audio
1,099,577
Unknown
814,717
Journal
744,218
Musical Score
736,033
Conference Proceeding
726,702
Map
568,736
Manuscript
289,102
Kit
238,859
Book Chapter
205,060
Photo
174,702
Newspaper
62,533
Reference Material
51,630
Physical Object
9,313
Article
1,971