Book 18,668 eBook 5,794 Video 1,315 Government Document 1,257 Microform 715 DVD 481 Thesis 294 Audio 281 CD 272 Journal 269 VHS 260 Conference Proceeding 128 Photo 103 Newspaper 94 Serial 89 Kit 71 Musical Score 68 Blu-ray Disc 61 Manuscript 15 Database 14 Cassette 11 Map 9 Software 9 Physical Object 8 Book Chapter 2 Electronic 2