Classification
610 - Medicine & health
900 - History & geography
30
320 - Political science
7
100 - Philosophy & psychology
4
170 - Ethics
4
300 - Social sciences
4
330 - Economics
4
333 - Economics of land & energy
4
304 - Factors affecting social behavior
3
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
581 - Specific topics in natural history
3
600 - Technology
3
140 - Specific philosophical schools
2
200 - Religion
2
361 - Social problems & social welfare in general
2
800 - Literature & rhetoric
2
301 - Sociology & anthropology
1
362 - Social welfare problems & services
1
370 - Education
1
398 - Folklore
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
580 - Plants (Botany)
1
614 - Incidence & prevention of disease
1
700 - The arts; fine & decorative arts
1