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United States
165,883
Dissertations, Academic
35,248
Education
21,630
Agriculture
17,759
Indians of North America
15,834
Women
15,592
English language
15,121
Bible
14,686
African Americans
13,401
World War, 1939-1945
12,067
Great Britain
11,584
Geology
9,889
California
9,603
Railroads
9,473
World War, 1914-1918
9,163
Water
8,693
Science
8,522
Roads
8,447
Children
8,220
Jews
8,095
Older people
7,790
Soviet Union
7,718
Medicine
7,525
China
7,496
Art
7,488
Transportation
7,411
Music
7,406
Forests and forestry
7,345
English
2,947,388
No linguistic content
37,912
German
21,148
French
19,375
Spanish
18,079
Russian
10,354
Latin
7,883
Italian
4,908
Hebrew
4,457
Yiddish
4,452
Undetermined
2,615
Chinese
2,225
Greek, Ancient (to 1453)
2,178
Ukrainian
1,529
Multiple languages
1,418
Polish
1,238
Portuguese
1,218
Vietnamese
1,154
Swedish
1,146
Greek, Modern (1453- )
1,143
Japanese
1,056
Armenian
1,016
Arabic
909
Norwegian
857
Persian
735
Dutch
693
Czech
670
Danish
638
Lithuanian
550
Hungarian
370
United States New York
7,463
United States California
4,395
England
184
Poland
119
Ukraine
90
Italy
83
1980-1989
413,864
1990-1999
396,152
1970-1979
392,636
1960-1969
286,804
2000-2009
236,346
1950-1959
190,544
1900-1909
164,167
1910-1919
153,773
1940-1949
138,776
1920-1929
123,861
1930-1939
121,794
1890-1899
98,220
1880-1889
66,553
1900
54,108
1870-1879
53,777
1860-1869
53,425
1990
49,639
1980
46,618
1850-1859
45,734
1989
45,244
1978
44,648
1977
44,090
1992
44,090
1991
43,285
1979
43,154
1976
42,970
1988
41,531
1993
41,312
1985
41,193
1984
41,079
Book
2,762,624
Serial
205,255
Journal
168,111
Biography
112,312
Conference
97,464
Music
82,909
Musical Score
82,836
Statistics
65,820
Directories
24,152
Microform
24,008
Manuscript
16,554
Dictionaries
15,200
Encyclopedias
4,317
Archive
2,411
Maps-Atlas
2,096
Map
2,068
Mixed Material
1,477
CDROM
1,030
Newspaper
622
Audio CD
310
Video (DVD)
114
Visual Material
103
Audio
73
Data File
63
Audio LP
43
Video (VHS)
22
University of Michigan
985,317
University of California
720,171
Harvard University
207,701
University of Minnesota
171,777
Cornell University
155,964
University of Virginia
124,659
Pennsylvania State University
102,079
New York Public Library
98,688
Library of Congress
83,446
Indiana University
80,910
The Ohio State University
74,454
Northwestern University
59,807
Purdue University
47,664
Columbia University
38,612
The University of Texas
35,268
Princeton University
28,095
University of Chicago
20,076
University of Iowa
19,334
Michigan State University
16,079
Duke University
9,839
Yale University
9,689
Rutgers University
9,488