Classification
613 - Personal health & safety
123
614 - Incidence & prevention of disease
104
616 - Diseases
67
610 - Medicine & health
50
571 - Physiology & related subjects
21
612 - Human physiology
11
306 - Culture & institutions
10
362 - Social welfare problems & services
10
618 - Gynecology, obstetrics, pediatrics & geriatrics
10
570 - Life sciences; biology
9
615 - Pharmacology & therapeutics
9
617 - Surgery & related medical specialties
9
641 - Food & drink
6
664 - Food technology
6
006 - Special computer methods
5
304 - Factors affecting social behavior
5
910 - Geography & travel
5
158 - Applied psychology
4
320 - Political science
4
338 - Production
4
621 - Applied physics
4
170 - Ethics
3
174 - Occupational ethics
3
301 - Sociology & anthropology
3
330 - Economics
3
333 - Economics of land & energy
3
620 - Engineering & allied operations
3
155 - Differential & developmental psychology
2
307 - Communities
2
572 - Biochemistry
2
577 - Ecology
2
631 - Techniques, equipment & materials
2
658 - General management
2
660 - Chemical engineering
2
796 - Athletic & outdoor sports & games
2
003 - Systems
1
004 - Data processing & computer science
1
150 - Psychology
1
300 - Social sciences
1
305 - Social groups
1
336 - Public finance
1
355 - Military science
1
364 - Criminology
1
370 - Education
1
509 - Historical, geographic & persons treatment
1
530 - Physics
1
543 - Analytical chemistry
1
551 - Geology, hydrology & meteorology
1
579 - Microorganisms, fungi & algae
1
590 - Animals (Zoology)
1
more ...