Classification
613 - Personal health & safety
183
614 - Incidence & prevention of disease
165
616 - Diseases
111
610 - Medicine & health
72
658 - General management
53
618 - Gynecology, obstetrics, pediatrics & geriatrics
20
571 - Physiology & related subjects
18
612 - Human physiology
16
158 - Applied psychology
15
617 - Surgery & related medical specialties
15
306 - Culture & institutions
14
615 - Pharmacology & therapeutics
12
641 - Food & drink
11
664 - Food technology
11
362 - Social welfare problems & services
10
621 - Applied physics
10
338 - Production
8
570 - Life sciences; biology
8
150 - Psychology
7
304 - Factors affecting social behavior
7
650 - Management & auxiliary services
6
174 - Occupational ethics
5
303 - Social processes
5
620 - Engineering & allied operations
5
910 - Geography & travel
5
006 - Special computer methods
4
301 - Sociology & anthropology
4
572 - Biochemistry
4
611 - Human anatomy, cytology & histology
4
155 - Differential & developmental psychology
3
170 - Ethics
3
300 - Social sciences
3
302 - Social interaction
3
333 - Economics of land & energy
3
361 - Social problems & social welfare in general
3
370 - Education
3
519 - Probabilities & applied mathematics
3
551 - Geology, hydrology & meteorology
3
305 - Social groups
2
307 - Communities
2
353 - Specific fields of public administration
2
378 - Higher education
2
577 - Ecology
2
579 - Microorganisms, fungi & algae
2
590 - Animals (Zoology)
2
629 - Other branches of engineering
2
631 - Techniques, equipment & materials
2
660 - Chemical engineering
2
670 - Manufacturing
2
796 - Athletic & outdoor sports & games
2
more ...