Classification
300 - Social sciences
581 - Specific topics in natural history
700 - The arts; fine & decorative arts
363 - Other social problems & services
6
000 - Computer science, information & general works
5
140 - Specific philosophical schools
4
333 - Economics of land & energy
4
380 - Commerce, communications & transportation
4
576 - Genetics & evolution
4
414 - Phonology & phonetics
3
500 - Natural sciences & mathematics
3
540 - Chemistry & allied sciences
3
551 - Geology, hydrology & meteorology
3
580 - Plants (Botany)
3
610 - Medicine & health
3
612 - Human physiology
3
620 - Engineering & allied operations
3
100 - Philosophy & psychology
2
200 - Religion
2
301 - Sociology & anthropology
2
320 - Political science
2
330 - Economics
1
400 - Language
1
600 - Technology
1
800 - Literature & rhetoric
1
900 - History & geography
1