Classification
100 - Philosophy & psychology
340 - Law
320 - Political science
65
330 - Economics
30
300 - Social sciences
27
900 - History & geography
24
140 - Specific philosophical schools
15
170 - Ethics
11
700 - The arts; fine & decorative arts
8
120 - Epistemology, causation & humankind
7
200 - Religion
7
370 - Education
7
000 - Computer science, information & general works
6
301 - Sociology & anthropology
6
333 - Economics of land & energy
6
610 - Medicine & health
6
576 - Genetics & evolution
5
361 - Social problems & social welfare in general
4
530 - Physics
4
336 - Public finance
3
380 - Commerce, communications & transportation
3
400 - Language
3
500 - Natural sciences & mathematics
3
600 - Technology
3
304 - Factors affecting social behavior
2
363 - Other social problems & services
2
364 - Criminology
2
551 - Geology, hydrology & meteorology
2
620 - Engineering & allied operations
2
770 - Photography, photographs & computer art
2
780 - Music
2
297 - Islam, Babism & Bahai Faith
1
360 - Social problems & services; associations
1
581 - Specific topics in natural history
1
658 - General management
1
800 - Literature & rhetoric
1