Classification
370 - Education
900 - History & geography
9
100 - Philosophy & psychology
5
300 - Social sciences
5
320 - Political science
3
600 - Technology
3
301 - Sociology & anthropology
2
330 - Economics
2
400 - Language
2
410 - Linguistics
2
780 - Music
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1
530 - Physics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1