Classification
100 - Philosophy & psychology
300 - Social sciences
320 - Political science
330 - Economics
333 - Economics of land & energy
1
350 - Public administration & military science
363 - Other social problems & services
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
600 - Technology
1
610 - Medicine & health
900 - History & geography
1