Classification
610 - Medicine & health
469
570 - Life sciences; biology
257
614 - Incidence & prevention of disease
219
616 - Diseases
194
613 - Personal health & safety
102
700 - The arts; fine & decorative arts
83
140 - Specific philosophical schools
51
330 - Economics
49
363 - Other social problems & services
49
380 - Commerce, communications & transportation
48
000 - Computer science, information & general works
47
519 - Probabilities & applied mathematics
46
576 - Genetics & evolution
42
333 - Economics of land & energy
39
615 - Pharmacology & therapeutics
39
571 - Physiology & related subjects
33
580 - Plants (Botany)
32
500 - Natural sciences & mathematics
24
304 - Factors affecting social behavior
23
618 - Gynecology, obstetrics, pediatrics & geriatrics
23
612 - Human physiology
22
551 - Geology, hydrology & meteorology
19
600 - Technology
17
620 - Engineering & allied operations
17
900 - History & geography
17
100 - Philosophy & psychology
15
362 - Social welfare problems & services
14
579 - Microorganisms, fungi & algae
13
581 - Specific topics in natural history
13
370 - Education
12
170 - Ethics
9
300 - Social sciences
9
301 - Sociology & anthropology
9
320 - Political science
9
658 - General management
9
910 - Geography & travel
8
617 - Surgery & related medical specialties
7
338 - Production
6
353 - Specific fields of public administration
6
540 - Chemistry & allied sciences
6
340 - Law
5
414 - Phonology & phonetics
5
530 - Physics
5
590 - Animals (Zoology)
5
630 - Agriculture & related technologies
5
174 - Occupational ethics
4
306 - Culture & institutions
4
510 - Mathematics
4
628 - Sanitary & municipal engineering
4
003 - Systems
3
more ...