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