Classification
616 - Diseases
418
150 - Psychology
161
155 - Differential & developmental psychology
161
612 - Human physiology
99
370 - Education
79
658 - General management
75
610 - Medicine & health
73
153 - Mental processes & intelligence
68
330 - Economics
68
100 - Philosophy & psychology
58
300 - Social sciences
51
158 - Applied psychology
50
302 - Social interaction
43
617 - Surgery & related medical specialties
37
301 - Sociology & anthropology
35
306 - Culture & institutions
34
613 - Personal health & safety
32
006 - Special computer methods
27
614 - Incidence & prevention of disease
26
333 - Economics of land & energy
25
500 - Natural sciences & mathematics
24
650 - Management & auxiliary services
23
618 - Gynecology, obstetrics, pediatrics & geriatrics
22
305 - Social groups
20
700 - The arts; fine & decorative arts
18
900 - History & geography
18
331 - Labor economics
17
338 - Production
17
128 - Humankind
15
304 - Factors affecting social behavior
15
371 - Schools & their activities; special education
15
571 - Physiology & related subjects
15
140 - Specific philosophical schools
14
361 - Social problems & social welfare in general
14
401 - Philosophy & theory
14
501 - Philosophy & theory
14
000 - Computer science, information & general works
12
004 - Data processing & computer science
12
152 - Perception, movement, emotions & drives
12
005 - Computer programming, programs & data
11
170 - Ethics
11
320 - Political science
11
001 - Knowledge
9
380 - Commerce, communications & transportation
9
591 - Specific topics in natural history
9
615 - Pharmacology & therapeutics
9
620 - Engineering & allied operations
9
303 - Social processes
8
410 - Linguistics
8
621 - Applied physics
8
more ...