Classification
100 - Philosophy & psychology
370 - Education
300 - Social sciences
92
320 - Political science
18
900 - History & geography
17
301 - Sociology & anthropology
13
700 - The arts; fine & decorative arts
13
140 - Specific philosophical schools
12
600 - Technology
11
610 - Medicine & health
10
170 - Ethics
8
200 - Religion
8
330 - Economics
8
340 - Law
8
400 - Language
8
333 - Economics of land & energy
7
380 - Commerce, communications & transportation
6
410 - Linguistics
6
304 - Factors affecting social behavior
5
780 - Music
5
000 - Computer science, information & general works
4
620 - Engineering & allied operations
4
360 - Social problems & services; associations
3
361 - Social problems & social welfare in general
3
364 - Criminology
3
500 - Natural sciences & mathematics
3
576 - Genetics & evolution
3
297 - Islam, Babism & Bahai Faith
2
630 - Agriculture & related technologies
2
658 - General management
2
800 - Literature & rhetoric
2
120 - Epistemology, causation & humankind
1
363 - Other social problems & services
1
530 - Physics
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1