Format
Article
1,865,261 results
Book
1,274,776 results
Review
694,125 results
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82,286 results
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68,325 results
Series/Journal
44,224 results
Journal
37,467 results
Microfilm
12,150 results
Literary Remains
4,750 results
Musical Score
3,808 results
Map
3,273 results
Microfiche
2,208 results
Audio
1,736 results
CD
1,335 results
Newspaper
1,241 results
Photo
1,022 results
Video
963 results
Statistics
729 results
Kit
693 results
Database
576 results
DVD
399 results
Unknown
379 results
VHS
325 results
Cassette
313 results
Website
309 results
Data Medium
168 results
Weblog
111 results
Manuscript
96 results
Slide
52 results
Research Data
40 results
Braille
15 results
Software
5 results
Physical object
1 results