Classification
610 - Medicine & health
620 - Engineering & allied operations
600 - Technology
7
333 - Economics of land & energy
3
630 - Agriculture & related technologies
3
900 - History & geography
3
140 - Specific philosophical schools
2
363 - Other social problems & services
2
100 - Philosophy & psychology
1
300 - Social sciences
1
330 - Economics
1
530 - Physics
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1