Classification
620 - Engineering & allied operations
600 - Technology
3
610 - Medicine & health
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
580 - Plants (Botany)
2
900 - History & geography
2
140 - Specific philosophical schools
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1