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