Classification
100 - Philosophy & psychology
5
120 - Epistemology, causation & humankind
500 - Natural sciences & mathematics
900 - History & geography
530 - Physics
3
160 - Logic
2
170 - Ethics
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
300 - Social sciences
1
301 - Sociology & anthropology
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
520 - Astronomy & allied sciences
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
720 - Architecture
1
800 - Literature & rhetoric
1