Classification
301 - Sociology & anthropology
330 - Economics
4
300 - Social sciences
3
320 - Political science
3
900 - History & geography
3
100 - Philosophy & psychology
2
340 - Law
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
333 - Economics of land & energy
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
364 - Criminology
1
400 - Language
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
600 - Technology
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1
973 - United States
1