Classification
000 - Computer science, information & general works
581 - Specific topics in natural history
600 - Technology
610 - Medicine & health
620 - Engineering & allied operations
630 - Agriculture & related technologies
4
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
363 - Other social problems & services
3
580 - Plants (Botany)
3
320 - Political science
2
330 - Economics
2
551 - Geology, hydrology & meteorology
2
100 - Philosophy & psychology
1
170 - Ethics
1
370 - Education
1
410 - Linguistics
1
530 - Physics
1
900 - History & geography
1