Classification
610 - Medicine & health
4,821
616 - Diseases
959
613 - Personal health & safety
833
614 - Incidence & prevention of disease
815
330 - Economics
684
363 - Other social problems & services
333
333 - Economics of land & energy
250
362 - Social welfare problems & services
238
615 - Pharmacology & therapeutics
236
370 - Education
218
320 - Political science
217
700 - The arts; fine & decorative arts
199
304 - Factors affecting social behavior
192
570 - Life sciences; biology
181
617 - Surgery & related medical specialties
165
306 - Culture & institutions
145
380 - Commerce, communications & transportation
141
340 - Law
135
612 - Human physiology
129
571 - Physiology & related subjects
126
618 - Gynecology, obstetrics, pediatrics & geriatrics
122
140 - Specific philosophical schools
120
000 - Computer science, information & general works
113
600 - Technology
109
300 - Social sciences
104
344 - Labor, social, education & cultural law
101
301 - Sociology & anthropology
98
658 - General management
96
100 - Philosophy & psychology
94
579 - Microorganisms, fungi & algae
87
338 - Production
84
664 - Food technology
82
361 - Social problems & social welfare in general
81
900 - History & geography
81
155 - Differential & developmental psychology
80
519 - Probabilities & applied mathematics
80
150 - Psychology
72
576 - Genetics & evolution
69
170 - Ethics
65
641 - Food & drink
64
577 - Ecology
60
620 - Engineering & allied operations
60
580 - Plants (Botany)
57
551 - Geology, hydrology & meteorology
55
540 - Chemistry & allied sciences
52
353 - Specific fields of public administration
50
910 - Geography & travel
45
500 - Natural sciences & mathematics
44
174 - Occupational ethics
42
572 - Biochemistry
42
more ...