Classification
610 - Medicine & health
431
306 - Culture & institutions
277
700 - The arts; fine & decorative arts
84
330 - Economics
77
333 - Economics of land & energy
55
150 - Psychology
47
301 - Sociology & anthropology
47
304 - Factors affecting social behavior
45
370 - Education
44
363 - Other social problems & services
38
305 - Social groups
36
613 - Personal health & safety
34
616 - Diseases
33
000 - Computer science, information & general works
30
100 - Philosophy & psychology
30
600 - Technology
30
140 - Specific philosophical schools
29
658 - General management
29
380 - Commerce, communications & transportation
28
614 - Incidence & prevention of disease
28
571 - Physiology & related subjects
27
612 - Human physiology
24
300 - Social sciences
22
320 - Political science
20
580 - Plants (Botany)
19
620 - Engineering & allied operations
19
361 - Social problems & social welfare in general
18
900 - History & geography
17
155 - Differential & developmental psychology
13
158 - Applied psychology
13
170 - Ethics
10
331 - Labor economics
10
551 - Geology, hydrology & meteorology
10
615 - Pharmacology & therapeutics
10
338 - Production
9
340 - Law
9
570 - Life sciences; biology
9
581 - Specific topics in natural history
8
618 - Gynecology, obstetrics, pediatrics & geriatrics
8
500 - Natural sciences & mathematics
7
650 - Management & auxiliary services
6
800 - Literature & rhetoric
6
302 - Social interaction
5
617 - Surgery & related medical specialties
5
630 - Agriculture & related technologies
5
641 - Food & drink
5
910 - Geography & travel
5
174 - Occupational ethics
4
200 - Religion
4
307 - Communities
4
more ...