Classification
100 - Philosophy & psychology
300 - Social sciences
4
320 - Political science
330 - Economics
780 - Music
900 - History & geography
410 - Linguistics
3
600 - Technology
3
700 - The arts; fine & decorative arts
3
400 - Language
2
620 - Engineering & allied operations
2
720 - Architecture
2
770 - Photography, photographs & computer art
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
200 - Religion
1
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1
530 - Physics
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1