Classification
100 - Philosophy & psychology
200 - Religion
330 - Economics
320 - Political science
20
900 - History & geography
6
140 - Specific philosophical schools
5
170 - Ethics
4
300 - Social sciences
4
800 - Literature & rhetoric
4
363 - Other social problems & services
3
000 - Computer science, information & general works
2
301 - Sociology & anthropology
2
333 - Economics of land & energy
2
410 - Linguistics
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
340 - Law
1
370 - Education
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
658 - General management
1
770 - Photography, photographs & computer art
1