Classification
616 - Diseases
422
617 - Surgery & related medical specialties
141
610 - Medicine & health
49
006 - Special computer methods
26
618 - Gynecology, obstetrics, pediatrics & geriatrics
19
615 - Pharmacology & therapeutics
14
614 - Incidence & prevention of disease
7
612 - Human physiology
6
362 - Social welfare problems & services
5
613 - Personal health & safety
5
338 - Production
4
061 - Organizations in North America
3
320 - Political science
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
330 - Economics
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
003 - Systems
1
005 - Computer programming, programs & data
1
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
358 - Air & other specialized forces
1
364 - Criminology
1
381 - Commerce
1
600 - Technology
1
628 - Sanitary & municipal engineering
1
658 - General management
1
900 - History & geography
1