Classification
300 - Social sciences
610 - Medicine & health
320 - Political science
6
333 - Economics of land & energy
5
301 - Sociology & anthropology
4
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
900 - History & geography
3
330 - Economics
2
370 - Education
2
340 - Law
1
364 - Criminology
1
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1
600 - Technology
1