Classification
170 - Ethics
330 - Economics
333 - Economics of land & energy
3
363 - Other social problems & services
600 - Technology
620 - Engineering & allied operations
3
140 - Specific philosophical schools
2
200 - Religion
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
320 - Political science
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1
900 - History & geography
1