Classification
140 - Specific philosophical schools
300 - Social sciences
320 - Political science
363 - Other social problems & services
600 - Technology
2
620 - Engineering & allied operations
330 - Economics
1
333 - Economics of land & energy
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1
900 - History & geography
1