Classification
333 - Economics of land & energy
900 - History & geography
100 - Philosophy & psychology
5
320 - Political science
4
140 - Specific philosophical schools
3
300 - Social sciences
3
301 - Sociology & anthropology
2
370 - Education
2
610 - Medicine & health
2
170 - Ethics
1
330 - Economics
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
600 - Technology
1
658 - General management
1