Classification
100 - Philosophy & psychology
320 - Political science
630 - Agriculture & related technologies
330 - Economics
9
600 - Technology
7
620 - Engineering & allied operations
7
300 - Social sciences
6
700 - The arts; fine & decorative arts
5
170 - Ethics
4
363 - Other social problems & services
4
900 - History & geography
4
000 - Computer science, information & general works
3
610 - Medicine & health
3
140 - Specific philosophical schools
2
333 - Economics of land & energy
2
410 - Linguistics
2
780 - Music
2
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
720 - Architecture
1
770 - Photography, photographs & computer art
1