Classification
620 - Engineering & allied operations
600 - Technology
6
900 - History & geography
6
363 - Other social problems & services
3
610 - Medicine & health
3
000 - Computer science, information & general works
2
700 - The arts; fine & decorative arts
2
781 - General principles & musical forms
2
333 - Economics of land & energy
1
410 - Linguistics
1
510 - Mathematics
1