Classification
333 - Economics of land & energy
330 - Economics
4
380 - Commerce, communications & transportation
3
000 - Computer science, information & general works
2
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
340 - Law
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
600 - Technology
1
621 - Applied physics
1
630 - Agriculture & related technologies
1