Classification
100 - Philosophy & psychology
170 - Ethics
140 - Specific philosophical schools
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
320 - Political science
2
330 - Economics
2
363 - Other social problems & services
2
200 - Religion
1
300 - Social sciences
1
333 - Economics of land & energy
1
370 - Education
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
800 - Literature & rhetoric
1
900 - History & geography
1