Classification
300 - Social sciences
320 - Political science
330 - Economics
900 - History & geography
630 - Agriculture & related technologies
4
100 - Philosophy & psychology
3
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
200 - Religion
1
333 - Economics of land & energy
1
340 - Law
1
400 - Language
1
410 - Linguistics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
780 - Music
1
800 - Literature & rhetoric
1