Classification
414 - Phonology & phonetics
500 - Natural sciences & mathematics
600 - Technology
6
620 - Engineering & allied operations
6
900 - History & geography
700 - The arts; fine & decorative arts
4
330 - Economics
2
333 - Economics of land & energy
2
000 - Computer science, information & general works
1
304 - Factors affecting social behavior
1
320 - Political science
1
340 - Law
1
530 - Physics
1
580 - Plants (Botany)
1
610 - Medicine & health
1