Classification
363 - Other social problems & services
2
580 - Plants (Botany)
581 - Specific topics in natural history
600 - Technology
2
620 - Engineering & allied operations
630 - Agriculture & related technologies
140 - Specific philosophical schools
1
330 - Economics
1
333 - Economics of land & energy
1
590 - Animals (Zoology)
1
610 - Medicine & health
1