Classification
300 - Social sciences
320 - Political science
730
330 - Economics
661
900 - History & geography
256
001 - Knowledge
143
301 - Sociology & anthropology
102
340 - Law
61
700 - The arts; fine & decorative arts
61
658 - General management
59
140 - Specific philosophical schools
51
304 - Factors affecting social behavior
49
370 - Education
43
302 - Social interaction
41
100 - Philosophy & psychology
39
200 - Religion
38
500 - Natural sciences & mathematics
38
333 - Economics of land & energy
37
630 - Agriculture & related technologies
35
363 - Other social problems & services
29
610 - Medicine & health
27
800 - Literature & rhetoric
26
600 - Technology
25
670 - Manufacturing
23
576 - Genetics & evolution
22
380 - Commerce, communications & transportation
19
338 - Production
17
400 - Language
17
000 - Computer science, information & general works
16
170 - Ethics
16
620 - Engineering & allied operations
15
331 - Labor economics
14
361 - Social problems & social welfare in general
12
364 - Criminology
12
350 - Public administration & military science
11
297 - Islam, Babism & Bahai Faith
10
381 - Commerce
9
410 - Linguistics
8
158 - Applied psychology
7
551 - Geology, hydrology & meteorology
7
303 - Social processes
6
360 - Social problems & services; associations
6
581 - Specific topics in natural history
6
650 - Management & auxiliary services
5
780 - Music
5
362 - Social welfare problems & services
4
720 - Architecture
3
120 - Epistemology, causation & humankind
2
305 - Social groups
2
332 - Financial economics
2
336 - Public finance
2
more ...