Classification
301 - Sociology & anthropology
610 - Medicine & health
300 - Social sciences
4
333 - Economics of land & energy
3
900 - History & geography
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
320 - Political science
2
330 - Economics
1
370 - Education
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
590 - Animals (Zoology)
1
600 - Technology
1