Classification
620 - Engineering & allied operations
610 - Medicine & health
13
333 - Economics of land & energy
12
000 - Computer science, information & general works
11
700 - The arts; fine & decorative arts
11
600 - Technology
10
580 - Plants (Botany)
9
380 - Commerce, communications & transportation
6
576 - Genetics & evolution
6
630 - Agriculture & related technologies
6
540 - Chemistry & allied sciences
5
140 - Specific philosophical schools
4
500 - Natural sciences & mathematics
4
300 - Social sciences
3
363 - Other social problems & services
3
414 - Phonology & phonetics
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
612 - Human physiology
3
900 - History & geography
3
100 - Philosophy & psychology
2
330 - Economics
2
590 - Animals (Zoology)
1
720 - Architecture
1
800 - Literature & rhetoric
1