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