Classification
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
000 - Computer science, information & general works
6
610 - Medicine & health
5
620 - Engineering & allied operations
5
140 - Specific philosophical schools
4
380 - Commerce, communications & transportation
4
540 - Chemistry & allied sciences
4
300 - Social sciences
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
414 - Phonology & phonetics
3
551 - Geology, hydrology & meteorology
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
612 - Human physiology
3
330 - Economics
2
600 - Technology
2
900 - History & geography
2
400 - Language
1
658 - General management
1
780 - Music
1