Classification
306 - Culture & institutions
161
610 - Medicine & health
70
300 - Social sciences
62
301 - Sociology & anthropology
33
303 - Social processes
25
330 - Economics
23
305 - Social groups
20
613 - Personal health & safety
20
361 - Social problems & social welfare in general
17
614 - Incidence & prevention of disease
17
320 - Political science
15
100 - Philosophy & psychology
13
900 - History & geography
13
616 - Diseases
9
170 - Ethics
7
333 - Economics of land & energy
7
340 - Law
6
370 - Education
6
140 - Specific philosophical schools
5
304 - Factors affecting social behavior
4
571 - Physiology & related subjects
4
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
3
150 - Psychology
3
363 - Other social problems & services
3
600 - Technology
3
910 - Geography & travel
3
155 - Differential & developmental psychology
2
200 - Religion
2
302 - Social interaction
2
327 - International relations
2
362 - Social welfare problems & services
2
364 - Criminology
2
380 - Commerce, communications & transportation
2
418 - Standard usage & applied linguistics
2
570 - Life sciences; biology
2
615 - Pharmacology & therapeutics
2
061 - Organizations in North America
1
176 - Ethics of sex & reproduction
1
341 - Law of nations
1
350 - Public administration & military science
1
400 - Language
1
407 - Education, research & related topics
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
510 - Mathematics
1
515 - Analysis
1
519 - Probabilities & applied mathematics
1
530 - Physics
1
581 - Specific topics in natural history
1
more ...