Classification
333 - Economics of land & energy
530 - Physics
2
580 - Plants (Botany)
000 - Computer science, information & general works
1
340 - Law
1
363 - Other social problems & services
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
900 - History & geography
1