Classification
000 - Computer science, information & general works
720 - Architecture
600 - Technology
4
620 - Engineering & allied operations
4
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
333 - Economics of land & energy
3
400 - Language
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
576 - Genetics & evolution
2
900 - History & geography
2
100 - Philosophy & psychology
1
170 - Ethics
1
330 - Economics
1