Classification
000 - Computer science, information & general works
320 - Political science
330 - Economics
600 - Technology
620 - Engineering & allied operations
900 - History & geography
700 - The arts; fine & decorative arts
9
333 - Economics of land & energy
8
300 - Social sciences
5
363 - Other social problems & services
4
370 - Education
4
380 - Commerce, communications & transportation
3
610 - Medicine & health
3
630 - Agriculture & related technologies
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
170 - Ethics
2
410 - Linguistics
2
530 - Physics
2
580 - Plants (Botany)
2
658 - General management
2
720 - Architecture
2
780 - Music
2
340 - Law
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1