Classification
170 - Ethics
200 - Religion
333 - Economics of land & energy
363 - Other social problems & services
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
320 - Political science
2
330 - Economics
2
581 - Specific topics in natural history
2
600 - Technology
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
340 - Law
1
630 - Agriculture & related technologies
1