Classification
333 - Economics of land & energy
540 - Chemistry & allied sciences
580 - Plants (Botany)
610 - Medicine & health
700 - The arts; fine & decorative arts
10
000 - Computer science, information & general works
8
140 - Specific philosophical schools
6
363 - Other social problems & services
5
380 - Commerce, communications & transportation
5
576 - Genetics & evolution
4
612 - Human physiology
4
620 - Engineering & allied operations
4
300 - Social sciences
3
330 - Economics
3
414 - Phonology & phonetics
3
500 - Natural sciences & mathematics
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
304 - Factors affecting social behavior
2
900 - History & geography
2
600 - Technology
1
720 - Architecture
1