Classification
330 - Economics
600 - Technology
7
620 - Engineering & allied operations
630 - Agriculture & related technologies
320 - Political science
4
333 - Economics of land & energy
4
363 - Other social problems & services
4
610 - Medicine & health
3
551 - Geology, hydrology & meteorology
2
140 - Specific philosophical schools
1
340 - Law
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
900 - History & geography
1