Classification
576 - Genetics & evolution
600 - Technology
620 - Engineering & allied operations
900 - History & geography
5
000 - Computer science, information & general works
4
330 - Economics
4
333 - Economics of land & energy
4
380 - Commerce, communications & transportation
4
700 - The arts; fine & decorative arts
4
720 - Architecture
3
363 - Other social problems & services
2
610 - Medicine & health
2
658 - General management
2
800 - Literature & rhetoric
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
500 - Natural sciences & mathematics
1