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