Classification
363 - Other social problems & services
4
500 - Natural sciences & mathematics
600 - Technology
4
620 - Engineering & allied operations
000 - Computer science, information & general works
3
333 - Economics of land & energy
3
530 - Physics
3
700 - The arts; fine & decorative arts
3
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
630 - Agriculture & related technologies
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
300 - Social sciences
1
320 - Political science
1
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
550 - Earth sciences
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
720 - Architecture
1
800 - Literature & rhetoric
1
900 - History & geography
1