Classification
300 - Social sciences
333 - Economics of land & energy
320 - Political science
8
140 - Specific philosophical schools
6
610 - Medicine & health
5
100 - Philosophy & psychology
4
330 - Economics
4
301 - Sociology & anthropology
3
900 - History & geography
3
370 - Education
2
600 - Technology
2
170 - Ethics
1
200 - Religion
1
340 - Law
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1