Classification
600 - Technology
9
620 - Engineering & allied operations
6
700 - The arts; fine & decorative arts
6
900 - History & geography
6
333 - Economics of land & energy
5
000 - Computer science, information & general works
3
140 - Specific philosophical schools
2
414 - Phonology & phonetics
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
363 - Other social problems & services
1
530 - Physics
1
540 - Chemistry & allied sciences
1