Classification
140 - Specific philosophical schools
300 - Social sciences
700 - The arts; fine & decorative arts
18
363 - Other social problems & services
17
333 - Economics of land & energy
13
320 - Political science
12
330 - Economics
11
301 - Sociology & anthropology
8
900 - History & geography
8
600 - Technology
7
620 - Engineering & allied operations
6
340 - Law
5
000 - Computer science, information & general works
4
304 - Factors affecting social behavior
4
630 - Agriculture & related technologies
4
720 - Architecture
4
170 - Ethics
3
380 - Commerce, communications & transportation
3
581 - Specific topics in natural history
3
610 - Medicine & health
3
800 - Literature & rhetoric
3
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
120 - Epistemology, causation & humankind
1
370 - Education
1
400 - Language
1
500 - Natural sciences & mathematics
1