Classification
520 - Astronomy & allied sciences
500 - Natural sciences & mathematics
466
900 - History & geography
18
530 - Physics
14
700 - The arts; fine & decorative arts
14
333 - Economics of land & energy
9
000 - Computer science, information & general works
8
300 - Social sciences
7
100 - Philosophy & psychology
6
600 - Technology
5
610 - Medicine & health
5
200 - Religion
4
320 - Political science
4
330 - Economics
4
370 - Education
4
620 - Engineering & allied operations
4
720 - Architecture
4
140 - Specific philosophical schools
3
363 - Other social problems & services
3
540 - Chemistry & allied sciences
3
581 - Specific topics in natural history
3
120 - Epistemology, causation & humankind
2
170 - Ethics
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
160 - Logic
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
400 - Language
1
510 - Mathematics
1
551 - Geology, hydrology & meteorology
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1