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