Classification
100 - Philosophy & psychology
170 - Ethics
320 - Political science
340 - Law
300 - Social sciences
21
330 - Economics
12
363 - Other social problems & services
12
900 - History & geography
11
140 - Specific philosophical schools
9
200 - Religion
9
610 - Medicine & health
9
370 - Education
6
600 - Technology
6
120 - Epistemology, causation & humankind
5
301 - Sociology & anthropology
3
333 - Economics of land & energy
3
000 - Computer science, information & general works
2
304 - Factors affecting social behavior
2
364 - Criminology
2
581 - Specific topics in natural history
2
700 - The arts; fine & decorative arts
2
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1