Classification
320 - Political science
330 - Economics
2
333 - Economics of land & energy
2
340 - Law
363 - Other social problems & services
581 - Specific topics in natural history
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1