Classification
380 - Commerce, communications & transportation
620 - Engineering & allied operations
5
600 - Technology
4
900 - History & geography
4
000 - Computer science, information & general works
3
700 - The arts; fine & decorative arts
3
333 - Economics of land & energy
2
330 - Economics
1
414 - Phonology & phonetics
1
580 - Plants (Botany)
1
610 - Medicine & health
1