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