Classification
140 - Specific philosophical schools
330 - Economics
5
333 - Economics of land & energy
4
000 - Computer science, information & general works
2
500 - Natural sciences & mathematics
2
700 - The arts; fine & decorative arts
2
170 - Ethics
1
300 - Social sciences
1
320 - Political science
1
363 - Other social problems & services
1
600 - Technology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
658 - General management
1