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