Classification
610 - Medicine & health
2,047
616 - Diseases
203
615 - Pharmacology & therapeutics
88
617 - Surgery & related medical specialties
76
614 - Incidence & prevention of disease
38
612 - Human physiology
34
613 - Personal health & safety
34
570 - Life sciences; biology
32
150 - Psychology
31
611 - Human anatomy, cytology & histology
25
344 - Labor, social, education & cultural law
24
579 - Microorganisms, fungi & algae
24
618 - Gynecology, obstetrics, pediatrics & geriatrics
22
540 - Chemistry & allied sciences
15
330 - Economics
9
571 - Physiology & related subjects
8
572 - Biochemistry
7
361 - Social problems & social welfare in general
6
515 - Analysis
6
590 - Animals (Zoology)
6
599 - Mammals
6
301 - Sociology & anthropology
5
306 - Culture & institutions
5
370 - Education
5
530 - Physics
5
547 - Organic chemistry
5
620 - Engineering & allied operations
5
155 - Differential & developmental psychology
4
320 - Political science
4
340 - Law
4
353 - Specific fields of public administration
4
543 - Analytical chemistry
4
100 - Philosophy & psychology
3
302 - Social interaction
3
362 - Social welfare problems & services
3
519 - Probabilities & applied mathematics
3
541 - Physical chemistry
3
576 - Genetics & evolution
3
660 - Chemical engineering
3
120 - Epistemology, causation & humankind
2
160 - Logic
2
338 - Production
2
500 - Natural sciences & mathematics
2
520 - Astronomy & allied sciences
2
577 - Ecology
2
580 - Plants (Botany)
2
621 - Applied physics
2
629 - Other branches of engineering
2
636 - Animal husbandry
2
900 - History & geography
2
more ...