Classification
540 - Chemistry & allied sciences
600 - Technology
3
330 - Economics
2
363 - Other social problems & services
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
333 - Economics of land & energy
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1