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