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