Classification
610 - Medicine & health
63
330 - Economics
12
363 - Other social problems & services
11
362 - Social welfare problems & services
6
370 - Education
6
700 - The arts; fine & decorative arts
5
140 - Specific philosophical schools
4
361 - Social problems & social welfare in general
4
616 - Diseases
4
100 - Philosophy & psychology
3
170 - Ethics
3
340 - Law
3
551 - Geology, hydrology & meteorology
3
600 - Technology
3
615 - Pharmacology & therapeutics
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
300 - Social sciences
1
305 - Social groups
1
306 - Culture & institutions
1
320 - Political science
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
570 - Life sciences; biology
1
590 - Animals (Zoology)
1
612 - Human physiology
1
613 - Personal health & safety
1
660 - Chemical engineering
1
900 - History & geography
1