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