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