Classification
304 - Factors affecting social behavior
333 - Economics of land & energy
2
140 - Specific philosophical schools
1
300 - Social sciences
1
320 - Political science
1
330 - Economics
1
363 - Other social problems & services
1
370 - Education
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1