Classification
100 - Philosophy & psychology
380 - Commerce, communications & transportation
500 - Natural sciences & mathematics
900 - History & geography
3
333 - Economics of land & energy
2
370 - Education
2
400 - Language
2
600 - Technology
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
120 - Epistemology, causation & humankind
1
300 - Social sciences
1
320 - Political science
1
363 - Other social problems & services
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1
800 - Literature & rhetoric
1