Classification
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
720 - Architecture
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
600 - Technology
4
620 - Engineering & allied operations
4
900 - History & geography
4
140 - Specific philosophical schools
3
320 - Political science
3
340 - Law
3
576 - Genetics & evolution
3
000 - Computer science, information & general works
2
333 - Economics of land & energy
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
800 - Literature & rhetoric
1