Format
Book
2,225,635
Thesis
31,899
Conference Proceeding
28,858
Journal
13,612
Unknown
10,751
Serial
10,435
Government Document
9,959
Electronic
6,118
Kit
4,567
Map
2,572
Book Chapter
1,655
Manuscript
1,643
Audio
1,394
Newspaper
775
Reference Material
688
Musical Score
480
Photo
273
Article
227
Physical Object
39