Classification
330 - Economics
30
610 - Medicine & health
16
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
6
363 - Other social problems & services
6
000 - Computer science, information & general works
5
380 - Commerce, communications & transportation
5
615 - Pharmacology & therapeutics
5
600 - Technology
4
614 - Incidence & prevention of disease
3
616 - Diseases
3
620 - Engineering & allied operations
3
720 - Architecture
3
900 - History & geography
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
300 - Social sciences
2
370 - Education
2
613 - Personal health & safety
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
320 - Political science
1
353 - Specific fields of public administration
1
361 - Social problems & social welfare in general
1
400 - Language
1
580 - Plants (Botany)
1