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Collection
299,066
Electronic Access
143,999
Gov Pub Electronic
141,547
Main Books 3rd Floor
75,599
Gov Pub Microfiche
58,840
Storage Gov Pub
24,452
CO Gov Pub Electronic
more ...
12,205
Audio and Visual 1st Floor
8,118
Storage Books
7,423
Storage Folded Maps
6,902
Spec Coll 3rd Floor
6,126
Microfilm 2nd Floor
5,390
Juv Coll 2nd Floor
3,493
New Books 1st Floor
3,323
Ref Coll 1st Floor
2,028
Spec Coll Energy 3rd Floor
1,846
Storage Flat Maps
1,825
Flat Maps 2nd Floor
1,540
Oversize 3rd Floor
1,388
Reserve 1st Floor
1,298
Storage Periodicals
1,193
Storage Gov Pub Media
823
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
262,823
Book
259,363
eBook
146,384
Electronic
40,155
Microfilm
36,644
Video
18,756
Map
more ...
11,540
Unknown
7,816
Serial
6,402
CD
4,666
Text
4,386
Musical Score
4,244
Record
2,557
Journal
2,166
DVD
1,042
VHS
789
Audio
675
Photo
663
Software
265
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
14,285
Geology
9,229
Appropriations and expenditures
6,612
Rules and practice
6,500
Management
5,252
United States Foreign relations
4,792
Mines and mineral resources
more ...
4,672
Groundwater
4,357
Geology, Stratigraphic
4,314
Water quality
4,313
History
4,243
Artificial intelligence
4,191
Officials and employees
4,082
Economics
3,468
Health
3,217
Business
3,111
Water-supply
2,979
United States Politics and government
2,896
Criticism and interpretation
2,817
United States History
2,695
Computer security
2,685
National security
2,683
Auditing
2,535
Evaluation
2,354
Mathematics
2,273
Operas
2,083
Entrepreneurship
2,044
United States
2,024
Selection and appointment
1,955
Computer science
1,813
Aquifers
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Author
73,532
SpringerLink (Online service)
39,580
ScienceDirect (Online service)
38,149
SpringerLink (Online Service)
30,631
Geological Survey (U.S.)
25,820
Infobase,
18,143
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
2,336
U.S. Fish and Wildlife Service
2,205
United States. National Park Service
2,127
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
1,825
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
788,924
English
8,931
Spanish
7,228
No linguistic content
5,671
German
5,537
French
4,996
eng
more ...
3,648
Italian
1,758
Russian
1,103
Undetermined
826
Latin
733
Chinese
564
Japanese
385
Portuguese
281
Ancient Greek
258
Multiple
235
Dutch
227
Arabic
221
Polish
185
Swedish
158
Greek
148
Hebrew
140
Czech
135
Korean
124
Norwegian
122
Hungarian
111
Danish
85
Vietnamese
47
Romanian
44
Turkish
43
Tagalog
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Genre
35,642
Conference papers and proceedings
32,934
Fiction
28,534
Sound recordings
26,072
Video recordings
23,487
Internet videos
21,747
Maps
more ...
16,947
Dictionaries
14,449
Periodicals
13,649
Legislative hearings
13,295
Biographies
12,944
Statistics
11,851
Handbooks and manuals
10,626
Bibliographies
9,025
Legislative materials
6,956
Technical reports
3,731
Congresses
3,663
Case studies
3,636
Scores
3,394
Topographic maps
3,068
Autobiographies
2,970
Operas
2,754
Drama
2,702
Statutes and codes
2,673
Instructional television programs
2,661
Excerpts
2,590
Treaties
2,447
Catalogs
2,212
Literature
1,815
Illustrated works
1,600
Academic theses
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Literary Form
Era
10,931
20th century
5,196
19th century
2,748
21st century
1,580
18th century
1,021
1564-1616
991
Civil War, 1861-1865
more ...
975
17th century
894
1945-
838
Cretaceous
751
1945-1989
592
16th century
554
1933-1945
519
Revolution, 1775-1783
494
1946-
485
1989-
447
Tertiary
441
To 1500
417
Quaternary
408
2009-
389
2001-2009
386
Early modern, 1500-1700
373
Colonial period, ca. 1600-1775
351
1991-
346
Precambrian
335
Paleozoic
294
Cenozoic
280
1960-
273
1951-
261
2000-
252
1929
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Region
186,447
United States
28,765
Colorado
8,652
California
7,158
Great Britain
5,265
China
5,249
Alaska
more ...
3,902
Europe
3,867
New Mexico
3,864
Utah
3,610
Arizona
3,359
Nevada
3,223
West (U.S.)
3,174
Texas
2,978
Wyoming
2,949
Montana
2,929
Oregon
2,850
Washington (State)
2,719
New York (State)
2,479
Florida
2,358
Idaho
2,339
Japan
2,258
India
2,127
Mexico
2,051
England
2,049
France
1,977
Germany
1,849
North America
1,754
Washington (D.C.)
1,699
Pennsylvania
1,651
Canada
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Call Number
93,788
Q - Science
64,349
H - Social Science
60,106
T - Technology
50,777
K - Law
43,311
P - Language and Literature
39,193
R - Medicine
more ...
36,406
E - United States History
31,803
L - Education
24,002
G - Geography, Anthropology, Recreation
18,607
D - World History
17,997
M - Music
16,622
A - General Works
15,909
B - Philosophy, Psychology, Religion
14,137
F - General American History
13,449
S - Agriculture
12,358
C - Historical Sciences
12,291
J - Political Science
10,352
N - Fine Arts
3,508
Z - Library Science
2,237
U - Military Science
1,951
V - Naval Science
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Year of Publication