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