Classification
000 - Computer science, information & general works
540 - Chemistry & allied sciences
610 - Medicine & health
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
9
333 - Economics of land & energy
8
140 - Specific philosophical schools
6
363 - Other social problems & services
5
500 - Natural sciences & mathematics
5
380 - Commerce, communications & transportation
4
414 - Phonology & phonetics
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
600 - Technology
4
612 - Human physiology
4
300 - Social sciences
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
630 - Agriculture & related technologies
2
100 - Philosophy & psychology
1
170 - Ethics
1
370 - Education
1
615 - Pharmacology & therapeutics
1
900 - History & geography
1