Classification
600 - Technology
650 - Management & auxiliary services
330 - Economics
5
333 - Economics of land & energy
4
000 - Computer science, information & general works
3
380 - Commerce, communications & transportation
3
657 - Accounting
3
658 - General management
3
700 - The arts; fine & decorative arts
3
331 - Labor economics
2
363 - Other social problems & services
2
576 - Genetics & evolution
2
900 - History & geography
2
153 - Mental processes & intelligence
1
300 - Social sciences
1
320 - Political science
1
414 - Phonology & phonetics
1
530 - Physics
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1