Classification
380 - Commerce, communications & transportation
540 - Chemistry & allied sciences
620 - Engineering & allied operations
600 - Technology
8
700 - The arts; fine & decorative arts
6
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
140 - Specific philosophical schools
2
330 - Economics
2
363 - Other social problems & services
2
400 - Language
2
580 - Plants (Botany)
2
340 - Law
1
576 - Genetics & evolution
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
658 - General management
1
900 - History & geography
1