Classification
600 - Technology
4
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3
900 - History & geography
3
000 - Computer science, information & general works
2
330 - Economics
2
363 - Other social problems & services
2
540 - Chemistry & allied sciences
2
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1