Classification
000 - Computer science, information & general works
331 - Labor economics
2
140 - Specific philosophical schools
1
320 - Political science
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
745 - Decorative arts
1