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