Classification
330 - Economics
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
5
620 - Engineering & allied operations
900 - History & geography
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
700 - The arts; fine & decorative arts
3
333 - Economics of land & energy
2
363 - Other social problems & services
2
610 - Medicine & health
2
720 - Architecture
2
340 - Law
1
400 - Language
1
500 - Natural sciences & mathematics
1
658 - General management
1
800 - Literature & rhetoric
1