Classification
320 - Political science
551 - Geology, hydrology & meteorology
610 - Medicine & health
630 - Agriculture & related technologies
330 - Economics
5
000 - Computer science, information & general works
4
363 - Other social problems & services
4
581 - Specific topics in natural history
4
333 - Economics of land & energy
3
580 - Plants (Botany)
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
100 - Philosophy & psychology
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
600 - Technology
1
620 - Engineering & allied operations
1