Classification
500 - Natural sciences & mathematics
900 - History & geography
600 - Technology
15
620 - Engineering & allied operations
15
700 - The arts; fine & decorative arts
14
333 - Economics of land & energy
9
140 - Specific philosophical schools
5
340 - Law
5
380 - Commerce, communications & transportation
5
576 - Genetics & evolution
5
610 - Medicine & health
5
000 - Computer science, information & general works
4
330 - Economics
4
363 - Other social problems & services
4
320 - Political science
3
414 - Phonology & phonetics
3
720 - Architecture
3
580 - Plants (Botany)
2
361 - Social problems & social welfare in general
1
400 - Language
1
658 - General management
1
780 - Music
1
800 - Literature & rhetoric
1