Classification
363 - Other social problems & services
581 - Specific topics in natural history
600 - Technology
5
620 - Engineering & allied operations
5
580 - Plants (Botany)
3
630 - Agriculture & related technologies
3
140 - Specific philosophical schools
2
333 - Economics of land & energy
2
590 - Animals (Zoology)
2
000 - Computer science, information & general works
1
300 - Social sciences
1
330 - Economics
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1