Classification
100 - Philosophy & psychology
600 - Technology
900 - History & geography
5
170 - Ethics
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
620 - Engineering & allied operations
2
720 - Architecture
2
140 - Specific philosophical schools
1
300 - Social sciences
1
320 - Political science
1
330 - Economics
1
410 - Linguistics
1
530 - Physics
1
630 - Agriculture & related technologies
1
770 - Photography, photographs & computer art
1
780 - Music
1
800 - Literature & rhetoric
1