Classification
300 - Social sciences
320 - Political science
330 - Economics
5,972
900 - History & geography
1,084
630 - Agriculture & related technologies
837
576 - Genetics & evolution
443
340 - Law
393
700 - The arts; fine & decorative arts
90
100 - Philosophy & psychology
62
333 - Economics of land & energy
53
370 - Education
45
301 - Sociology & anthropology
44
170 - Ethics
40
363 - Other social problems & services
37
140 - Specific philosophical schools
35
600 - Technology
34
610 - Medicine & health
32
000 - Computer science, information & general works
26
200 - Religion
24
380 - Commerce, communications & transportation
20
800 - Literature & rhetoric
18
304 - Factors affecting social behavior
17
500 - Natural sciences & mathematics
16
620 - Engineering & allied operations
15
361 - Social problems & social welfare in general
12
350 - Public administration & military science
11
160 - Logic
9
400 - Language
9
551 - Geology, hydrology & meteorology
8
581 - Specific topics in natural history
8
780 - Music
7
720 - Architecture
6
943 - Central Europe; Germany
6
657 - Accounting
5
336 - Public finance
4
360 - Social problems & services; associations
4
410 - Linguistics
4
327 - International relations
3
364 - Criminology
3
530 - Physics
3
338 - Production
2
382 - International commerce
2
550 - Earth sciences
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
305 - Social groups
1
321 - Systems of governments & states
1
331 - Labor economics
1
335 - Socialism & related systems
1
more ...