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