Classification
170 - Ethics
320 - Political science
340 - Law
100 - Philosophy & psychology
20
330 - Economics
18
700 - The arts; fine & decorative arts
12
140 - Specific philosophical schools
9
300 - Social sciences
8
900 - History & geography
7
200 - Religion
5
600 - Technology
5
363 - Other social problems & services
4
301 - Sociology & anthropology
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
120 - Epistemology, causation & humankind
2
333 - Economics of land & energy
2
361 - Social problems & social welfare in general
2
370 - Education
2
380 - Commerce, communications & transportation
2
400 - Language
2
581 - Specific topics in natural history
2
658 - General management
2
800 - Literature & rhetoric
2
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
364 - Criminology
1
398 - Folklore
1
410 - Linguistics
1
530 - Physics
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1