Classification
540 - Chemistry & allied sciences
576 - Genetics & evolution
600 - Technology
620 - Engineering & allied operations
4
000 - Computer science, information & general works
2
333 - Economics of land & energy
2
414 - Phonology & phonetics
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
304 - Factors affecting social behavior
1
363 - Other social problems & services
1
530 - Physics
1
580 - Plants (Botany)
1
610 - Medicine & health
1
800 - Literature & rhetoric
1