Classification
140 - Specific philosophical schools
320 - Political science
340 - Law
700 - The arts; fine & decorative arts
22
300 - Social sciences
20
900 - History & geography
18
100 - Philosophy & psychology
16
363 - Other social problems & services
14
370 - Education
11
330 - Economics
10
600 - Technology
10
170 - Ethics
9
333 - Economics of land & energy
8
304 - Factors affecting social behavior
7
200 - Religion
6
620 - Engineering & allied operations
6
380 - Commerce, communications & transportation
5
576 - Genetics & evolution
5
610 - Medicine & health
5
000 - Computer science, information & general works
4
301 - Sociology & anthropology
4
500 - Natural sciences & mathematics
4
551 - Geology, hydrology & meteorology
4
720 - Architecture
4
581 - Specific topics in natural history
3
120 - Epistemology, causation & humankind
2
361 - Social problems & social welfare in general
2
364 - Criminology
2
400 - Language
2
410 - Linguistics
2
580 - Plants (Botany)
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
360 - Social problems & services; associations
1
530 - Physics
1
658 - General management
1