Book 2,682,681 Government Document 214,831 Audio 106,478 Microfilm 52,660 Video 51,610 Musical Score 48,209 Conference Proceeding 45,260 DVD 43,564 CD 35,764 Map 34,470 Serial 28,855 Thesis 27,391 Database 7,415 VHS 7,109 Unknown 5,189 Photo 3,658 Manuscript 3,444 Book Chapter 2,253 Mixed Materials 1,384 Physical Object 692 Newspaper 681 Cassette 571 Blu-ray Disc 430 Software 426 Reference Material 231 Slide 171 Globe 78 Sensor Image 20 Article 17 Braille 8