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