Classification
333 - Economics of land & energy
520 - Astronomy & allied sciences
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
3
530 - Physics
3
610 - Medicine & health
3
370 - Education
2
500 - Natural sciences & mathematics
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
600 - Technology
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
304 - Factors affecting social behavior
1
330 - Economics
1
363 - Other social problems & services
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1
900 - History & geography
1