Classification
320 - Political science
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
900 - History & geography
600 - Technology
9
700 - The arts; fine & decorative arts
9
333 - Economics of land & energy
8
370 - Education
6
000 - Computer science, information & general works
5
620 - Engineering & allied operations
5
300 - Social sciences
4
720 - Architecture
4
140 - Specific philosophical schools
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
610 - Medicine & health
3
200 - Religion
2
340 - Law
2
576 - Genetics & evolution
2
100 - Philosophy & psychology
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
580 - Plants (Botany)
1
657 - Accounting
1
658 - General management
1