Classification
140 - Specific philosophical schools
300 - Social sciences
320 - Political science
600 - Technology
330 - Economics
7
363 - Other social problems & services
5
620 - Engineering & allied operations
5
700 - The arts; fine & decorative arts
5
900 - History & geography
5
333 - Economics of land & energy
4
000 - Computer science, information & general works
3
100 - Philosophy & psychology
3
370 - Education
3
170 - Ethics
2
301 - Sociology & anthropology
2
340 - Law
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
304 - Factors affecting social behavior
1
576 - Genetics & evolution
1
800 - Literature & rhetoric
1