Classification
140 - Specific philosophical schools
600 - Technology
620 - Engineering & allied operations
7
100 - Philosophy & psychology
5
170 - Ethics
5
363 - Other social problems & services
5
900 - History & geography
5
000 - Computer science, information & general works
4
320 - Political science
4
630 - Agriculture & related technologies
4
330 - Economics
3
333 - Economics of land & energy
3
581 - Specific topics in natural history
3
200 - Religion
2
301 - Sociology & anthropology
2
380 - Commerce, communications & transportation
2
500 - Natural sciences & mathematics
2
610 - Medicine & health
2
300 - Social sciences
1
304 - Factors affecting social behavior
1
410 - Linguistics
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
700 - The arts; fine & decorative arts
1
780 - Music
1
791 - Public performances
1
800 - Literature & rhetoric
1