Classification
320 - Political science
330 - Economics
630 - Agriculture & related technologies
800 - Literature & rhetoric
000 - Computer science, information & general works
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
700 - The arts; fine & decorative arts
1