Classification
300 - Social sciences
301 - Sociology & anthropology
320 - Political science
330 - Economics
900 - History & geography
8
340 - Law
7
100 - Philosophy & psychology
6
140 - Specific philosophical schools
5
333 - Economics of land & energy
5
600 - Technology
5
200 - Religion
4
576 - Genetics & evolution
3
363 - Other social problems & services
2
370 - Education
2
581 - Specific topics in natural history
2
170 - Ethics
1
304 - Factors affecting social behavior
1
380 - Commerce, communications & transportation
1
400 - Language
1
530 - Physics
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1