Classification
380 - Commerce, communications & transportation
410 - Linguistics
900 - History & geography
400 - Language
10
600 - Technology
6
330 - Economics
5
620 - Engineering & allied operations
5
000 - Computer science, information & general works
4
700 - The arts; fine & decorative arts
4
800 - Literature & rhetoric
4
300 - Social sciences
3
320 - Political science
3
610 - Medicine & health
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
370 - Education
2
576 - Genetics & evolution
2
658 - General management
2
780 - Music
2
500 - Natural sciences & mathematics
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
770 - Photography, photographs & computer art
1