Classification
000 - Computer science, information & general works
4
700 - The arts; fine & decorative arts
4
540 - Chemistry & allied sciences
3
600 - Technology
3
330 - Economics
2
363 - Other social problems & services
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1