Classification
571 - Physiology & related subjects
2,079
616 - Diseases
864
572 - Biochemistry
476
610 - Medicine & health
388
612 - Human physiology
331
570 - Life sciences; biology
155
580 - Plants (Botany)
153
579 - Microorganisms, fungi & algae
125
615 - Pharmacology & therapeutics
109
611 - Human anatomy, cytology & histology
88
660 - Chemical engineering
76
061 - Organizations in North America
67
590 - Animals (Zoology)
67
620 - Engineering & allied operations
47
630 - Agriculture & related technologies
43
617 - Surgery & related medical specialties
40
576 - Genetics & evolution
32
618 - Gynecology, obstetrics, pediatrics & geriatrics
31
614 - Incidence & prevention of disease
30
577 - Ecology
29
581 - Specific topics in natural history
29
547 - Organic chemistry
24
530 - Physics
20
006 - Special computer methods
18
333 - Economics of land & energy
17
543 - Analytical chemistry
16
500 - Natural sciences & mathematics
12
540 - Chemistry & allied sciences
12
613 - Personal health & safety
12
001 - Knowledge
11
300 - Social sciences
11
363 - Other social problems & services
11
000 - Computer science, information & general works
10
573 - Specific physiological systems in animals
10
599 - Mammals
10
140 - Specific philosophical schools
9
621 - Applied physics
9
700 - The arts; fine & decorative arts
9
005 - Computer programming, programs & data
8
301 - Sociology & anthropology
6
541 - Physical chemistry
6
519 - Probabilities & applied mathematics
5
546 - Inorganic chemistry
5
551 - Geology, hydrology & meteorology
5
600 - Technology
5
634 - Orchards, fruits & forestry
5
304 - Factors affecting social behavior
4
380 - Commerce, communications & transportation
4
501 - Philosophy & theory
4
510 - Mathematics
4
more ...