Classification
333 - Economics of land & energy
3
140 - Specific philosophical schools
2
330 - Economics
2
363 - Other social problems & services
2
580 - Plants (Botany)
2
612 - Human physiology
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
610 - Medicine & health
1
900 - History & geography
1