Classification
330 - Economics
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
700 - The arts; fine & decorative arts
333 - Economics of land & energy
6
000 - Computer science, information & general works
5
140 - Specific philosophical schools
5
320 - Political science
4
363 - Other social problems & services
4
620 - Engineering & allied operations
4
900 - History & geography
4
610 - Medicine & health
3
370 - Education
2
551 - Geology, hydrology & meteorology
2
630 - Agriculture & related technologies
2
658 - General management
2
720 - Architecture
2
800 - Literature & rhetoric
2
200 - Religion
1
304 - Factors affecting social behavior
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
657 - Accounting
1