Classification
320 - Political science
330 - Economics
600 - Technology
620 - Engineering & allied operations
4
630 - Agriculture & related technologies
000 - Computer science, information & general works
3
333 - Economics of land & energy
3
363 - Other social problems & services
2
370 - Education
2
700 - The arts; fine & decorative arts
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
300 - Social sciences
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
657 - Accounting
1
900 - History & geography
1