Classification
200 - Religion
600 - Technology
620 - Engineering & allied operations
4
140 - Specific philosophical schools
3
363 - Other social problems & services
3
170 - Ethics
2
301 - Sociology & anthropology
2
320 - Political science
2
330 - Economics
2
700 - The arts; fine & decorative arts
2
300 - Social sciences
1
333 - Economics of land & energy
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
900 - History & geography
1