Classification
333 - Economics of land & energy
2
363 - Other social problems & services
580 - Plants (Botany)
600 - Technology
2
620 - Engineering & allied operations
2
900 - History & geography
000 - Computer science, information & general works
1
330 - Economics
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1