Classification
100 - Philosophy & psychology
2
300 - Social sciences
2
370 - Education
600 - Technology
2
780 - Music
900 - History & geography
2
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
320 - Political science
1
330 - Economics
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
576 - Genetics & evolution
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1