Classification
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
580 - Plants (Botany)
2
600 - Technology
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
333 - Economics of land & energy
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
900 - History & geography
1