Format
Article
1,971
Audio
1,099,307
Book
38,713,336
Book Chapter
205,056
Conference Proceeding
726,132
Electronic
1,692,187
Government Document
1,785,543
Journal
744,126
Kit
238,835
Manuscript
289,081
Map
568,689
Musical Score
735,936
Newspaper
62,531
Photo
174,695
Physical Object
9,311
Reference Material
51,617
Serial
1,378,600
Thesis
1,345,427
Unknown
814,667