Classification
100 - Philosophy & psychology
320 - Political science
340 - Law
330 - Economics
25
300 - Social sciences
16
900 - History & geography
16
170 - Ethics
13
140 - Specific philosophical schools
10
700 - The arts; fine & decorative arts
8
370 - Education
7
333 - Economics of land & energy
6
301 - Sociology & anthropology
5
363 - Other social problems & services
5
200 - Religion
4
361 - Social problems & social welfare in general
4
600 - Technology
4
336 - Public finance
3
400 - Language
3
576 - Genetics & evolution
3
581 - Specific topics in natural history
3
120 - Epistemology, causation & humankind
2
380 - Commerce, communications & transportation
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
620 - Engineering & allied operations
2
658 - General management
2
800 - Literature & rhetoric
2
000 - Computer science, information & general works
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
364 - Criminology
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
610 - Medicine & health
1
770 - Photography, photographs & computer art
1
780 - Music
1