Classification
610 - Medicine & health
3,110
613 - Personal health & safety
729
614 - Incidence & prevention of disease
723
616 - Diseases
571
330 - Economics
260
362 - Social welfare problems & services
164
615 - Pharmacology & therapeutics
159
320 - Political science
135
617 - Surgery & related medical specialties
128
363 - Other social problems & services
109
370 - Education
103
570 - Life sciences; biology
99
700 - The arts; fine & decorative arts
90
304 - Factors affecting social behavior
89
344 - Labor, social, education & cultural law
88
333 - Economics of land & energy
87
306 - Culture & institutions
78
340 - Law
78
301 - Sociology & anthropology
76
612 - Human physiology
75
618 - Gynecology, obstetrics, pediatrics & geriatrics
73
571 - Physiology & related subjects
69
140 - Specific philosophical schools
63
155 - Differential & developmental psychology
59
338 - Production
58
150 - Psychology
55
664 - Food technology
52
380 - Commerce, communications & transportation
51
658 - General management
51
900 - History & geography
51
300 - Social sciences
49
361 - Social problems & social welfare in general
49
000 - Computer science, information & general works
48
600 - Technology
48
353 - Specific fields of public administration
47
641 - Food & drink
41
579 - Microorganisms, fungi & algae
37
170 - Ethics
36
100 - Philosophy & psychology
35
551 - Geology, hydrology & meteorology
34
611 - Human anatomy, cytology & histology
32
519 - Probabilities & applied mathematics
31
577 - Ecology
31
540 - Chemistry & allied sciences
28
580 - Plants (Botany)
26
174 - Occupational ethics
24
620 - Engineering & allied operations
23
364 - Criminology
22
500 - Natural sciences & mathematics
21
576 - Genetics & evolution
21
more ...