Classification
520 - Astronomy & allied sciences
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
370 - Education
2
610 - Medicine & health
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
330 - Economics
1
400 - Language
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
600 - Technology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1
900 - History & geography
1