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