Classification
320 - Political science
333 - Economics of land & energy
340 - Law
363 - Other social problems & services
580 - Plants (Botany)
630 - Agriculture & related technologies
2
000 - Computer science, information & general works
1
330 - Economics
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1