Format
Book
862,271
Conference Proceeding
79,116
Government Document
43,668
Electronic
38,866
Journal
18,568
Thesis
15,492
Unknown
12,095
Serial
9,981
Map
5,320
Manuscript
5,285
Audio
2,789
Musical Score
2,143
Book Chapter
1,146
Kit
742
Physical Object
649
Article
438
Reference Material
400
Photo
293
Newspaper
10