Classification
616 - Diseases
1,010
618 - Gynecology, obstetrics, pediatrics & geriatrics
636
617 - Surgery & related medical specialties
374
610 - Medicine & health
349
700 - The arts; fine & decorative arts
55
615 - Pharmacology & therapeutics
47
333 - Economics of land & energy
38
370 - Education
36
155 - Differential & developmental psychology
34
611 - Human anatomy, cytology & histology
31
599 - Mammals
30
612 - Human physiology
29
000 - Computer science, information & general works
28
613 - Personal health & safety
27
614 - Incidence & prevention of disease
26
571 - Physiology & related subjects
23
580 - Plants (Botany)
18
140 - Specific philosophical schools
16
600 - Technology
16
330 - Economics
13
570 - Life sciences; biology
13
150 - Psychology
11
380 - Commerce, communications & transportation
11
620 - Engineering & allied operations
11
363 - Other social problems & services
9
006 - Special computer methods
8
540 - Chemistry & allied sciences
8
900 - History & geography
8
100 - Philosophy & psychology
7
576 - Genetics & evolution
6
320 - Political science
5
344 - Labor, social, education & cultural law
4
400 - Language
4
174 - Occupational ethics
3
300 - Social sciences
3
304 - Factors affecting social behavior
3
360 - Social problems & services; associations
3
572 - Biochemistry
3
579 - Microorganisms, fungi & algae
3
581 - Specific topics in natural history
3
361 - Social problems & social welfare in general
2
362 - Social welfare problems & services
2
500 - Natural sciences & mathematics
2
573 - Specific physiological systems in animals
2
630 - Agriculture & related technologies
2
720 - Architecture
2
780 - Music
2
005 - Computer programming, programs & data
1
061 - Organizations in North America
1
153 - Mental processes & intelligence
1
more ...