Format
Book
616,932
Conference Proceeding
67,992
Government Document
52,092
Electronic
29,573
Thesis
22,578
Journal
14,607
Serial
9,374
Unknown
6,406
Manuscript
3,703
Map
2,879
Audio
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Musical Score
1,306
Reference Material
425
Article
320
Physical Object
259
Kit
244
Photo
195
Book Chapter
54
Newspaper
37