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Collection
298,477
Electronic Access
143,999
Gov Pub Electronic
141,509
Main Books 3rd Floor
75,599
Gov Pub Microfiche
58,837
Storage Gov Pub
24,452
CO Gov Pub Electronic
more ...
12,204
Audio and Visual 1st Floor
8,104
Storage Books
7,423
Storage Folded Maps
6,901
Spec Coll 3rd Floor
6,126
Microfilm 2nd Floor
5,390
Juv Coll 2nd Floor
3,352
New Books 1st Floor
3,321
Ref Coll 1st Floor
2,028
Spec Coll Energy 3rd Floor
1,846
Storage Flat Maps
1,825
Flat Maps 2nd Floor
1,539
Oversize 3rd Floor
1,388
Reserve 1st Floor
1,298
Storage Periodicals
1,193
Storage Gov Pub Media
822
Gov Pub Ref 1st Floor
474
Storage Microfiche
420
Bestsellers 1st Floor
386
Periodicals
308
Storage Colo Doc
88
Microfiche 2nd Floor
66
Ref Oversize 1st Floor
57
Spec Coll Oversize 3rd Floor
56
Special Coll Rare Books
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Format
262,633
Book
259,222
eBook
145,948
Electronic
40,155
Microfilm
36,633
Video
18,752
Map
more ...
11,540
Unknown
7,811
Serial
6,403
CD
4,666
Text
4,385
Musical Score
4,244
Record
2,559
Journal
2,165
DVD
1,042
VHS
788
Audio
673
Photo
664
Software
264
Manuscript
259
Image
186
Slide
141
StillImage
115
Cassette
33
Still Image
24
Blu-ray Disc
19
Kit
19
Text; Still Image
17
Brochure
16
Sensor Image
13
Physical Object
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Subject
14,230
Geology
9,229
Appropriations and expenditures
6,612
Rules and practice
6,498
Management
5,250
United States Foreign relations
4,785
Mines and mineral resources
more ...
4,669
Groundwater
4,352
Geology, Stratigraphic
4,313
Water quality
4,311
History
4,241
Artificial intelligence
4,191
Officials and employees
4,081
Economics
3,466
Health
3,217
Business
3,110
Water-supply
2,974
United States Politics and government
2,892
Criticism and interpretation
2,815
United States History
2,693
Computer security
2,685
National security
2,683
Auditing
2,535
Evaluation
2,351
Mathematics
2,273
Operas
2,083
Entrepreneurship
2,041
United States
2,024
Selection and appointment
1,955
Computer science
1,813
Aquifers
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Author
73,535
SpringerLink (Online service)
39,580
ScienceDirect (Online service)
38,091
SpringerLink (Online Service)
30,544
Geological Survey (U.S.)
25,809
Infobase,
18,129
Geological Survey (U.S.),
more ...
15,222
Literature Online (Online Service)
12,704
Oxford Scholarship Online
11,841
Films for the Humanities & Sciences (Firm)
11,799
Infobase
10,378
Library of Congress. Congressional Research Service,
7,446
EBSCOhost
3,989
United States,
3,388
United States. Bureau of Mines
2,564
Educational Resources Information Center (U.S.)
2,513
National Renewable Energy Laboratory (U.S.),
2,462
Law Library of Congress (U.S.). Global Legal Research Directorate,
2,428
United States. Congress. House. Committee on Rules
2,337
U.S. Fish and Wildlife Service
2,205
United States. National Park Service
2,130
United States. Bureau of Land Management
2,123
Prendismo, LLC (Firm)
2,065
ProQuest (Firm)
2,024
United States. Congress. Senate. Committee on Energy and Natural Resources
1,830
United States. Forest Service
1,778
Colorado State University. Cooperative Extension Service
1,699
United States. Environmental Protection Agency
1,687
National Renewable Energy Laboratory (U.S.)
1,647
Public Broadcasting Service (U.S.)
1,529
United States. Bureau of the Census
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Language
788,218
English
8,847
Spanish
7,228
No linguistic content
5,666
German
5,534
French
4,996
eng
more ...
3,645
Italian
1,754
Russian
1,101
Undetermined
826
Latin
732
Chinese
563
Japanese
385
Portuguese
279
Ancient Greek
258
Multiple
235
Dutch
227
Arabic
221
Polish
185
Swedish
157
Greek
148
Hebrew
140
Czech
135
Korean
123
Norwegian
121
Hungarian
111
Danish
85
Vietnamese
47
Romanian
44
Turkish
43
Tagalog
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Genre
35,643
Conference papers and proceedings
32,939
Fiction
28,538
Sound recordings
26,073
Video recordings
23,476
Internet videos
21,928
Maps
more ...
16,948
Dictionaries
14,454
Periodicals
13,649
Legislative hearings
13,293
Biographies
12,943
Statistics
11,847
Handbooks and manuals
10,624
Bibliographies
9,025
Legislative materials
6,954
Technical reports
3,734
Congresses
3,662
Case studies
3,635
Scores
3,327
Topographic maps
3,066
Autobiographies
2,970
Operas
2,757
Drama
2,702
Statutes and codes
2,673
Instructional television programs
2,661
Excerpts
2,590
Treaties
2,448
Catalogs
2,212
Literature
1,816
Illustrated works
1,599
Academic theses
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Literary Form
Era
10,909
20th century
5,185
19th century
2,737
21st century
1,583
18th century
1,019
1564-1616
991
Civil War, 1861-1865
more ...
973
17th century
892
1945-
838
Cretaceous
748
1945-1989
591
16th century
553
1933-1945
519
Revolution, 1775-1783
492
1946-
485
1989-
447
Tertiary
441
To 1500
417
Quaternary
408
2009-
389
2001-2009
385
Early modern, 1500-1700
373
Colonial period, ca. 1600-1775
349
1991-
346
Precambrian
334
Paleozoic
293
Cenozoic
279
1960-
273
1951-
261
2000-
252
1929
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Region
186,394
United States
28,755
Colorado
8,648
California
7,154
Great Britain
5,264
China
5,244
Alaska
more ...
3,900
Europe
3,867
New Mexico
3,852
Utah
3,600
Arizona
3,356
Nevada
3,217
West (U.S.)
3,172
Texas
2,969
Wyoming
2,945
Montana
2,928
Oregon
2,850
Washington (State)
2,717
New York (State)
2,479
Florida
2,360
Idaho
2,336
Japan
2,258
India
2,127
Mexico
2,050
England
2,044
France
1,979
Germany
1,845
North America
1,753
Washington (D.C.)
1,698
Pennsylvania
1,647
Canada
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Call Number
93,716
Q - Science
64,319
H - Social Science
60,068
T - Technology
50,772
K - Law
43,292
P - Language and Literature
39,124
R - Medicine
more ...
36,401
E - United States History
31,796
L - Education
23,499
G - Geography, Anthropology, Recreation
18,597
D - World History
18,078
M - Music
16,633
A - General Works
15,898
B - Philosophy, Psychology, Religion
14,131
F - General American History
13,438
S - Agriculture
12,354
C - Historical Sciences
12,279
J - Political Science
10,350
N - Fine Arts
3,502
Z - Library Science
2,233
U - Military Science
1,951
V - Naval Science
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Year of Publication