Classification
100 - Philosophy & psychology
170 - Ethics
300 - Social sciences
330 - Economics
320 - Political science
15
140 - Specific philosophical schools
7
200 - Religion
4
333 - Economics of land & energy
4
340 - Law
4
600 - Technology
3
610 - Medicine & health
3
700 - The arts; fine & decorative arts
3
900 - History & geography
3
000 - Computer science, information & general works
2
301 - Sociology & anthropology
2
361 - Social problems & social welfare in general
2
363 - Other social problems & services
2
370 - Education
2
304 - Factors affecting social behavior
1
551 - Geology, hydrology & meteorology
1
630 - Agriculture & related technologies
1