Classification
100 - Philosophy & psychology
330 - Economics
610 - Medicine & health
900 - History & geography
600 - Technology
5
300 - Social sciences
4
333 - Economics of land & energy
3
370 - Education
3
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
320 - Political science
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
350 - Public administration & military science
1
363 - Other social problems & services
1
530 - Physics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
780 - Music
1
800 - Literature & rhetoric
1