Format
Book
2,711,951
Thesis
86,589
Unknown
70,357
Serial
68,830
Conference Proceeding
57,694
Journal
54,220
Electronic
47,921
Audio
41,813
Musical Score
34,853
Map
28,378
Book Chapter
20,110
Manuscript
14,063
Government Document
11,341
Kit
9,418
Photo
4,792
Newspaper
2,100
Reference Material
2,080
Physical Object
244
Article
91