Classification
100 - Philosophy & psychology
140 - Specific philosophical schools
300 - Social sciences
320 - Political science
19
900 - History & geography
9
301 - Sociology & anthropology
8
370 - Education
8
170 - Ethics
7
330 - Economics
7
340 - Law
6
200 - Religion
5
600 - Technology
5
700 - The arts; fine & decorative arts
5
333 - Economics of land & energy
4
610 - Medicine & health
3
800 - Literature & rhetoric
3
361 - Social problems & social welfare in general
2
576 - Genetics & evolution
2
780 - Music
2
000 - Computer science, information & general works
1
120 - Epistemology, causation & humankind
1
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1