Classification
576 - Genetics & evolution
780 - Music
900 - History & geography
4
100 - Philosophy & psychology
2
301 - Sociology & anthropology
2
333 - Economics of land & energy
2
370 - Education
2
400 - Language
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
300 - Social sciences
1
330 - Economics
1
410 - Linguistics
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1