Classification
333 - Economics of land & energy
3
414 - Phonology & phonetics
610 - Medicine & health
800 - Literature & rhetoric
363 - Other social problems & services
2
580 - Plants (Botany)
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
330 - Economics
1
540 - Chemistry & allied sciences
1
600 - Technology
1
620 - Engineering & allied operations
1
900 - History & geography
1