Classification
320 - Political science
540 - Chemistry & allied sciences
000 - Computer science, information & general works
9
333 - Economics of land & energy
8
600 - Technology
8
620 - Engineering & allied operations
8
330 - Economics
7
363 - Other social problems & services
7
630 - Agriculture & related technologies
6
551 - Geology, hydrology & meteorology
5
700 - The arts; fine & decorative arts
5
380 - Commerce, communications & transportation
4
500 - Natural sciences & mathematics
4
610 - Medicine & health
4
140 - Specific philosophical schools
3
370 - Education
3
300 - Social sciences
2
414 - Phonology & phonetics
2
530 - Physics
2
581 - Specific topics in natural history
2
800 - Literature & rhetoric
2
900 - History & geography
2
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
400 - Language
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1