Format
Book
2,204,166
Thesis
44,134
Electronic
42,889
Conference Proceeding
28,139
Journal
25,195
Serial
18,071
Unknown
12,094
Manuscript
3,563
Audio
3,106
Kit
2,826
Book Chapter
1,247
Government Document
1,145
Map
959
Musical Score
917
Photo
601
Newspaper
475
Reference Material
297
Physical Object
30
Article
12