Classification
100 - Philosophy & psychology
140 - Specific philosophical schools
330 - Economics
363 - Other social problems & services
333 - Economics of land & energy
5
170 - Ethics
4
320 - Political science
3
581 - Specific topics in natural history
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
1
200 - Religion
1
340 - Law
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1