Classification
400 - Language
330 - Economics
7
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
6
410 - Linguistics
6
600 - Technology
6
900 - History & geography
6
000 - Computer science, information & general works
5
370 - Education
4
620 - Engineering & allied operations
4
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
300 - Social sciences
3
301 - Sociology & anthropology
3
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
320 - Political science
2
500 - Natural sciences & mathematics
2
630 - Agriculture & related technologies
2
780 - Music
2
800 - Literature & rhetoric
2
340 - Law
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
658 - General management
1