Classification
900 - History & geography
610 - Medicine & health
77
100 - Philosophy & psychology
13
800 - Literature & rhetoric
13
330 - Economics
9
361 - Social problems & social welfare in general
6
380 - Commerce, communications & transportation
6
200 - Religion
5
370 - Education
4
600 - Technology
4
612 - Human physiology
4
616 - Diseases
4
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
320 - Political science
3
362 - Social welfare problems & services
3
363 - Other social problems & services
3
580 - Plants (Botany)
3
170 - Ethics
2
301 - Sociology & anthropology
2
340 - Law
2
614 - Incidence & prevention of disease
2
620 - Engineering & allied operations
2
551 - Geology, hydrology & meteorology
1
615 - Pharmacology & therapeutics
1
940 - History of Europe
1