Classification
300 - Social sciences
330 - Economics
363 - Other social problems & services
320 - Political science
9
333 - Economics of land & energy
7
140 - Specific philosophical schools
6
700 - The arts; fine & decorative arts
6
551 - Geology, hydrology & meteorology
4
000 - Computer science, information & general works
3
340 - Law
3
100 - Philosophy & psychology
2
370 - Education
2
400 - Language
2
581 - Specific topics in natural history
2
600 - Technology
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
900 - History & geography
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
800 - Literature & rhetoric
1