Classification
616 - Diseases
2,637
610 - Medicine & health
549
617 - Surgery & related medical specialties
231
618 - Gynecology, obstetrics, pediatrics & geriatrics
143
615 - Pharmacology & therapeutics
105
571 - Physiology & related subjects
84
612 - Human physiology
62
613 - Personal health & safety
41
614 - Incidence & prevention of disease
31
579 - Microorganisms, fungi & algae
24
700 - The arts; fine & decorative arts
18
611 - Human anatomy, cytology & histology
14
572 - Biochemistry
13
006 - Special computer methods
12
620 - Engineering & allied operations
12
150 - Psychology
10
570 - Life sciences; biology
9
333 - Economics of land & energy
7
170 - Ethics
6
330 - Economics
6
363 - Other social problems & services
6
581 - Specific topics in natural history
5
599 - Mammals
5
061 - Organizations in North America
4
100 - Philosophy & psychology
4
140 - Specific philosophical schools
4
580 - Plants (Botany)
4
590 - Animals (Zoology)
4
621 - Applied physics
4
000 - Computer science, information & general works
3
155 - Differential & developmental psychology
3
304 - Factors affecting social behavior
3
320 - Political science
3
540 - Chemistry & allied sciences
3
660 - Chemical engineering
3
900 - History & geography
3
174 - Occupational ethics
2
340 - Law
2
344 - Labor, social, education & cultural law
2
353 - Specific fields of public administration
2
410 - Linguistics
2
519 - Probabilities & applied mathematics
2
541 - Physical chemistry
2
543 - Analytical chemistry
2
551 - Geology, hydrology & meteorology
2
577 - Ecology
2
641 - Food & drink
2
664 - Food technology
2
111 - Ontology
1
153 - Mental processes & intelligence
1
more ...