Classification
551 - Geology, hydrology & meteorology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
600 - Technology
4
333 - Economics of land & energy
3
363 - Other social problems & services
3
580 - Plants (Botany)
3
900 - History & geography
3
000 - Computer science, information & general works
2
330 - Economics
2
320 - Political science
1
380 - Commerce, communications & transportation
1
800 - Literature & rhetoric
1