Classification
100 - Philosophy & psychology
320 - Political science
600 - Technology
700 - The arts; fine & decorative arts
330 - Economics
3
363 - Other social problems & services
3
900 - History & geography
3
300 - Social sciences
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
333 - Economics of land & energy
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
610 - Medicine & health
1