Classification
500 - Natural sciences & mathematics
600 - Technology
620 - Engineering & allied operations
5
700 - The arts; fine & decorative arts
5
720 - Architecture
900 - History & geography
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
576 - Genetics & evolution
4
140 - Specific philosophical schools
3
320 - Political science
3
340 - Law
3
100 - Philosophy & psychology
2
000 - Computer science, information & general works
1
120 - Epistemology, causation & humankind
1
300 - Social sciences
1
330 - Economics
1
333 - Economics of land & energy
1
370 - Education
1
530 - Physics
1
540 - Chemistry & allied sciences
1
658 - General management
1
800 - Literature & rhetoric
1