Classification
320 - Political science
330 - Economics
340 - Law
7,377
900 - History & geography
6,819
300 - Social sciences
6,034
630 - Agriculture & related technologies
2,367
700 - The arts; fine & decorative arts
1,563
576 - Genetics & evolution
1,364
333 - Economics of land & energy
776
370 - Education
755
200 - Religion
578
610 - Medicine & health
463
363 - Other social problems & services
349
170 - Ethics
339
100 - Philosophy & psychology
327
600 - Technology
317
800 - Literature & rhetoric
260
380 - Commerce, communications & transportation
190
304 - Factors affecting social behavior
184
140 - Specific philosophical schools
175
500 - Natural sciences & mathematics
172
000 - Computer science, information & general works
144
160 - Logic
118
400 - Language
94
720 - Architecture
86
551 - Geology, hydrology & meteorology
82
361 - Social problems & social welfare in general
75
336 - Public finance
74
620 - Engineering & allied operations
63
780 - Music
60
658 - General management
47
350 - Public administration & military science
43
581 - Specific topics in natural history
41
301 - Sociology & anthropology
35
530 - Physics
21
650 - Management & auxiliary services
21
657 - Accounting
20
580 - Plants (Botany)
18
297 - Islam, Babism & Bahai Faith
17
360 - Social problems & services; associations
16
550 - Earth sciences
16
920 - Biography, genealogy & insignia
16
791 - Public performances
12
332 - Financial economics
11
410 - Linguistics
10
520 - Astronomy & allied sciences
7
364 - Criminology
6
414 - Phonology & phonetics
6
540 - Chemistry & allied sciences
6
296 - Judaism
5
more ...