Classification
170 - Ethics
320 - Political science
100 - Philosophy & psychology
83
330 - Economics
59
300 - Social sciences
32
700 - The arts; fine & decorative arts
29
140 - Specific philosophical schools
28
200 - Religion
25
340 - Law
25
900 - History & geography
25
363 - Other social problems & services
17
600 - Technology
14
333 - Economics of land & energy
12
380 - Commerce, communications & transportation
11
610 - Medicine & health
10
120 - Epistemology, causation & humankind
9
301 - Sociology & anthropology
9
620 - Engineering & allied operations
9
000 - Computer science, information & general works
8
304 - Factors affecting social behavior
8
370 - Education
7
400 - Language
7
581 - Specific topics in natural history
7
361 - Social problems & social welfare in general
5
800 - Literature & rhetoric
5
410 - Linguistics
4
551 - Geology, hydrology & meteorology
4
630 - Agriculture & related technologies
4
530 - Physics
3
297 - Islam, Babism & Bahai Faith
2
360 - Social problems & services; associations
2
296 - Judaism
1
350 - Public administration & military science
1
364 - Criminology
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
576 - Genetics & evolution
1
658 - General management
1
780 - Music
1