Classification
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
800 - Literature & rhetoric
333 - Economics of land & energy
6
610 - Medicine & health
4
140 - Specific philosophical schools
3
000 - Computer science, information & general works
2
304 - Factors affecting social behavior
2
320 - Political science
2
400 - Language
2
576 - Genetics & evolution
2
620 - Engineering & allied operations
2
658 - General management
2
900 - History & geography
2
363 - Other social problems & services
1
370 - Education
1
530 - Physics
1
657 - Accounting
1
720 - Architecture
1