Classification
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
6
620 - Engineering & allied operations
658 - General management
700 - The arts; fine & decorative arts
363 - Other social problems & services
4
900 - History & geography
4
333 - Economics of land & energy
3
370 - Education
3
320 - Political science
2
580 - Plants (Botany)
2
720 - Architecture
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
300 - Social sciences
1
340 - Law
1
400 - Language
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
780 - Music
1
800 - Literature & rhetoric
1