Classification
100 - Philosophy & psychology
610 - Medicine & health
330 - Economics
6
320 - Political science
5
700 - The arts; fine & decorative arts
5
900 - History & geography
5
140 - Specific philosophical schools
4
304 - Factors affecting social behavior
4
333 - Economics of land & energy
4
361 - Social problems & social welfare in general
4
340 - Law
3
370 - Education
3
600 - Technology
3
620 - Engineering & allied operations
3
170 - Ethics
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
616 - Diseases
2
000 - Computer science, information & general works
1
300 - Social sciences
1
301 - Sociology & anthropology
1
362 - Social welfare problems & services
1
410 - Linguistics
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1