Classification
610 - Medicine & health
170 - Ethics
4
320 - Political science
3
362 - Social welfare problems & services
3
370 - Education
3
380 - Commerce, communications & transportation
3
330 - Economics
2
361 - Social problems & social welfare in general
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
616 - Diseases
2
900 - History & geography
2
000 - Computer science, information & general works
1
001 - Knowledge
1
304 - Factors affecting social behavior
1
331 - Labor economics
1
363 - Other social problems & services
1
615 - Pharmacology & therapeutics
1
700 - The arts; fine & decorative arts
1