Classification
571 - Physiology & related subjects
1,079
616 - Diseases
437
572 - Biochemistry
195
610 - Medicine & health
155
612 - Human physiology
141
570 - Life sciences; biology
64
579 - Microorganisms, fungi & algae
49
615 - Pharmacology & therapeutics
44
660 - Chemical engineering
41
061 - Organizations in North America
35
580 - Plants (Botany)
27
614 - Incidence & prevention of disease
27
611 - Human anatomy, cytology & histology
24
620 - Engineering & allied operations
19
617 - Surgery & related medical specialties
17
547 - Organic chemistry
14
576 - Genetics & evolution
14
581 - Specific topics in natural history
9
599 - Mammals
9
543 - Analytical chemistry
8
630 - Agriculture & related technologies
7
618 - Gynecology, obstetrics, pediatrics & geriatrics
5
590 - Animals (Zoology)
4
613 - Personal health & safety
4
621 - Applied physics
4
004 - Data processing & computer science
3
006 - Special computer methods
3
591 - Specific topics in natural history
3
631 - Techniques, equipment & materials
3
003 - Systems
2
500 - Natural sciences & mathematics
2
520 - Astronomy & allied sciences
2
530 - Physics
2
573 - Specific physiological systems in animals
2
577 - Ecology
2
670 - Manufacturing
2
001 - Knowledge
1
005 - Computer programming, programs & data
1
057 - Serials in Slavic languages
1
174 - Occupational ethics
1
300 - Social sciences
1
301 - Sociology & anthropology
1
306 - Culture & institutions
1
344 - Labor, social, education & cultural law
1
510 - Mathematics
1
515 - Analysis
1
540 - Chemistry & allied sciences
1
541 - Physical chemistry
1
551 - Geology, hydrology & meteorology
1
592 - Invertebrates
1
more ...