Classification
320 - Political science
4
363 - Other social problems & services
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
100 - Philosophy & psychology
3
330 - Economics
3
300 - Social sciences
2
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
576 - Genetics & evolution
2
120 - Epistemology, causation & humankind
1
620 - Engineering & allied operations
1