Classification
616 - Diseases
2,536
612 - Human physiology
889
610 - Medicine & health
754
617 - Surgery & related medical specialties
629
615 - Pharmacology & therapeutics
264
006 - Special computer methods
260
618 - Gynecology, obstetrics, pediatrics & geriatrics
135
571 - Physiology & related subjects
119
570 - Life sciences; biology
72
700 - The arts; fine & decorative arts
63
150 - Psychology
48
333 - Economics of land & energy
46
572 - Biochemistry
43
613 - Personal health & safety
39
100 - Philosophy & psychology
36
000 - Computer science, information & general works
33
140 - Specific philosophical schools
33
500 - Natural sciences & mathematics
29
600 - Technology
28
363 - Other social problems & services
26
061 - Organizations in North America
25
330 - Economics
25
580 - Plants (Botany)
25
611 - Human anatomy, cytology & histology
25
370 - Education
24
579 - Microorganisms, fungi & algae
24
620 - Engineering & allied operations
24
614 - Incidence & prevention of disease
23
300 - Social sciences
18
900 - History & geography
18
001 - Knowledge
17
004 - Data processing & computer science
17
005 - Computer programming, programs & data
16
155 - Differential & developmental psychology
15
576 - Genetics & evolution
15
153 - Mental processes & intelligence
14
530 - Physics
13
540 - Chemistry & allied sciences
13
658 - General management
13
170 - Ethics
11
304 - Factors affecting social behavior
11
380 - Commerce, communications & transportation
11
301 - Sociology & anthropology
9
573 - Specific physiological systems in animals
9
621 - Applied physics
9
174 - Occupational ethics
8
374 - Adult education
8
660 - Chemical engineering
8
414 - Phonology & phonetics
7
306 - Culture & institutions
6
more ...