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