Classification
100 - Philosophy & psychology
140 - Specific philosophical schools
1
300 - Social sciences
3
301 - Sociology & anthropology
320 - Political science
2
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
370 - Education
2
400 - Language
2
410 - Linguistics
2
576 - Genetics & evolution
2
581 - Specific topics in natural history
1
600 - Technology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
780 - Music
1
900 - History & geography