Classification
300 - Social sciences
320 - Political science
330 - Economics
2
333 - Economics of land & energy
2
363 - Other social problems & services
600 - Technology
2
610 - Medicine & health
900 - History & geography
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
350 - Public administration & military science
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1